Add TimescaleDB PostgreSQL extension

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+  - name: Slack chat
+    url: https://github.com/cloudnative-pg/cloudnative-pg?tab=readme-ov-file#communications
+    about: Please join the slack channel and interact with our community

.github/ISSUE_TEMPLATE/extension.yaml

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+name: New Extension Proposal
+description: Propose a new PostgreSQL extension to be included in the containers and commit to its maintenance.
+title: "[New Extension]: "
+labels: ["triage", "new-extension"]
+projects: ["cloudnative-pg/postgres-extensions-containers"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for proposing a new extension for the PostgreSQL Extensions Containers project!
+
+        The submission process requires the proposer to commit to becoming the **Component Owner** and taking on the long-term maintenance of the extension image. Please review the [governance document for the submission process](https://github.com/cloudnative-pg/postgres-extensions-containers?tab=readme-ov-file#submission-process).
+
+  - type: checkboxes
+    id: search
+    attributes:
+      label: Is there an existing issue for this extension request?
+      description: Before you submit a request, please **search existing issues** to ensure this extension hasn't already been proposed.
+      options:
+        - label: I have searched for an existing issue, and could not find a duplicate request.
+          required: true
+
+  - type: input
+    id: extension-name
+    attributes:
+      label: Extension Name
+      description: What is the official name of the PostgreSQL extension?
+      placeholder: ex. pgvector
+    validations:
+      required: true
+
+  - type: input
+    id: project-url
+    attributes:
+      label: Project Repository URL
+      description: The URL of the main source code repository (e.g., GitHub, GitLab).
+      placeholder: ex. https://github.com/pgvector/pgvector
+    validations:
+      required: true
+
+  - type: input
+    id: website-url
+    attributes:
+      label: Extension Website URL (Optional)
+      description: The URL of the official website or main documentation page.
+      placeholder: ex. https://pgvector.io/
+    validations:
+      required: false
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Short Description
+      description: A brief description of the extension and its primary use case.
+      placeholder: ex. The pgvector extension provides vector similarity search capabilities for PostgreSQL.
+    validations:
+      required: true
+
+  - type: input
+    id: license-url
+    attributes:
+      label: Main LICENSE Link
+      description: A direct link to the main license file in the repository (e.g., a link to the raw LICENSE file).
+      placeholder: ex. https://github.com/pgvector/pgvector/blob/master/LICENSE
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: license-check
+    attributes:
+      label: License Compliance
+      description: Please confirm the license of the extension complies with the **allowed licenses** for this project.
+      options:
+        - label: The extension's license (linked above) complies with the list of allowed licenses.
+          required: true
+
+  - type: textarea
+    id: dependent-extensions
+    attributes:
+      label: Known Dependent Extensions
+      description: List any other PostgreSQL extensions that MUST be installed before or alongside this extension (e.g., if this extension requires 'plpgsql' or 'postgis' to be present). If none, please state "None".
+      placeholder: ex. postgis
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: maintenance-commitment
+    attributes:
+      label: Component Owner and Maintenance Commitment
+      description: By checking this box, you confirm your commitment to the long-term maintenance of the extension image. This includes providing updates for new upstream versions, responding to security issues, and ensuring compatibility with new PostgreSQL/OS versions.
+      options:
+        - label: I/My organization commit to becoming the Component Owner and maintaining the extension image in the future.
+          required: true
+
+  - type: textarea
+    id: additional-notes
+    attributes:
+      label: Additional Notes (Optional)
+      description: Any other relevant information, required dependencies (like OS packages), or context that might be useful for packaging.
+      placeholder: ex. This extension requires the 'openssl' library (OS package) to be installed.
+    validations:
+      required: false
+
+  - type: input
+    id: github-handles
+    attributes:
+      label: GitHub Handles of Component Owners
+      description: List the GitHub handles (e.g., `@user1`, `@org/team`) that will be responsible for maintaining the extension and should be added to the `CODEOWNERS` file.
+      placeholder: ex. @user1
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/cloudnative-pg/governance/blob/main/CODE_OF_CONDUCT.md)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/workflows/bake.yml

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+name: Build, test and publish extensions
+
+on:
+  push:
+  workflow_dispatch:
+    inputs:
+      extension_name:
+        description: "The PostgreSQL extension to build (directory name)"
+        required: true
+        type: choice
+        options:
+          - pgvector
+          - postgis
+          - pgaudit
+
+defaults:
+  run:
+    shell: 'bash -Eeuo pipefail -x {0}'
+
+permissions: {}
+
+jobs:
+  # Gather extensions that have been modified
+  change-triage:
+    name: Check changed files
+    runs-on: ubuntu-24.04
+    outputs:
+      matrix: ${{ steps.get-matrix.outputs.matrix}}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
+        with:
+          persist-credentials: false
+
+      - name: Check for changes
+        uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
+        id: filter
+        with:
+          filters: |
+            _shared: &shared
+              - 'docker-bake.hcl'
+              - 'Makefile'
+              - 'kind-config.yaml'
+              - 'test/**'
+              - '.github/workflows/bake*.yml'
+            pgvector:
+              - 'pgvector/**'
+              - *shared
+            postgis:
+              - 'postgis/**'
+              - *shared
+            timescaledb:
+              - 'timescaledb/**'
+              - *shared
+            pgaudit:
+              - 'pgaudit/**'
+              - *shared
+
+      # Compute a matrix containing the list of all extensions that have been modified
+      - name: Compute matrix
+        id: get-matrix
+        env:
+          # JSON array containing the extensions that have been changed
+          CHANGES: ${{ steps.filter.outputs.changes }}
+          # Input Extension name
+          INPUT_EXTENSION_NAME: ${{ github.event.inputs.extension_name }}
+        run: |
+          if [[ "${{ github.event_name }}" == 'workflow_dispatch' ]]; then
+            CHANGES="[\"$INPUT_EXTENSION_NAME\"]"
+          fi
+
+          # Filter away the shared filter
+          EXTENSIONS_CHANGED=$(echo "$CHANGES" | jq -c 'map(select(. != "_shared"))')
+
+          echo "matrix=$EXTENSIONS_CHANGED" >> "$GITHUB_OUTPUT"
+
+  Bake:
+    name: Bake
+    needs: change-triage
+    permissions:
+      packages: write
+      contents: read
+      id-token: write
+      security-events: write
+    if: ${{ join(fromJSON(needs.change-triage.outputs.matrix)) != '' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        extension: ${{ fromJSON(needs.change-triage.outputs.matrix) }}
+    uses: ./.github/workflows/bake_targets.yml
+    with:
+      extension_name: ${{ matrix.extension }}
+    secrets:
+      SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}