github: Build master daily docker images and for stable/X.Y on push

frrouting/frr:master will be generated every day
frrouting/frr:vX.Y.Z will be generated every time a new push is done on the
stable/X.Y branch.

Takes up to 3 hours to build and publish images.

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

.github/workflows/docker-daily-master.yml

@@ -0,0 +1,51 @@
+name: Build daily 'master' images for Docker
+
+on:
+  schedule:
+    - cron: '59 23 * * *'
+
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  docker_daily_master:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Custom variables
+        id: vars
+        run: |
+          # To package a specific git commit, the date of the commit gets
+          # appended to the latest release, e.g. 1.0.0_git20180204.
+          # This is the requirement by APKBUILD (abuild).
+          # More details: https://wiki.alpinelinux.org/wiki/APKBUILD_Reference.
+          echo ::set-output name=date::$(date +'%Y%m%d')
+
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          ref: master
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: ./docker/alpine/Dockerfile
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/frr:master
+          build-args: PKGVER=${{ steps.vars.outputs.date }}
+          platforms: linux/amd64,linux/arm64,linux/arm/v7

.github/workflows/docker-stable.yml

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+name: Build stable branch images for Docker
+
+on:
+  push:
+    branches:
+      - 'stable/**'
+
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  docker_daily_master:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Custom variables
+        id: vars
+        run: |
+          # To package a specific git commit, the date of the commit gets
+          # appended to the latest release, e.g. 1.0.0_git20180204.
+          # This is the requirement by APKBUILD (abuild).
+          # More details: https://wiki.alpinelinux.org/wiki/APKBUILD_Reference.
+          echo ::set-output name=date::$(date +'%Y%m%d')
+          # Get the real version specified in configure.ac file.
+          echo ::set-output name=frr_version::$(grep AC_INIT configure.ac | cut -d '[' -f3 | cut -d ']' -f 1)
+
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: ./docker/alpine/Dockerfile
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/frr:v${{ steps.vars.outputs.frr_version }}
+          build-args: PKGVER=${{ steps.vars.outputs.date }}
+          platforms: linux/amd64,linux/arm64,linux/arm/v7