Switch from circleci to Github Actions

.github/ISSUE_TEMPLATE/dependabot.yml

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+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/ISSUE_TEMPLATE/release.yml

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+changelog:
+  exclude:
+    authors:
+      - dependabot
+      - pre-commit-ci

.github/ISSUE_TEMPLATE/workflows/ci.yml

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+name: CI
+
+on: [pull_request, push]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
+
+env:
+  # https://github.com/pytest-dev/pytest/issues/2042#issuecomment-429289164
+  PY_IGNORE_IMPORTMISMATCH: 1
+
+jobs:
+  pytest:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        deps:
+          - label: Latest
+            spec: >-
+              gdal
+          - label: Minimum
+            spec: >-
+              python=3.9
+              gdal=3.5
+
+      fail-fast: false
+    name: ${{ matrix.os }} • ${{ matrix.deps.label }}
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash -l {0}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup environment
+        uses: mamba-org/setup-micromamba@v2
+        with:
+          environment-file: environment.yaml
+          environment-name: s1-reader-env
+          generate-run-shell: false
+          create-args: ${{ matrix.deps.spec }}
+          condarc: |
+            channels:
+              - conda-forge
+      - name: Install
+        run: |
+          python -m pip install .
+      - name: Test
+        run: |
+          python -m pip install pytest-recording
+          python -m pytest -n0