Consolidate tag builds and rebuilds to one workflow. (#2)

.github/workflows/build-tags.yaml

@@ -0,0 +1,69 @@
+name: build-tags
+
+on:
+  # build when a new tag is created
+  push:
+    tags:
+      - 'v*.*.*'
+  # rebuild tags on a cron
+  schedule:
+    # * is a special character in YAML so you have to quote this string
+    - cron:  '0 * * * *'
+
+jobs:
+
+  provide-tags:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      # checkout repo with all tags
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      # set matrix output to all git tags listed in a JSON-parsable array    
+      - id: set-matrix
+        run: echo "::set-output name=matrix::$( jq -cRs 'split("\n")[:-1]' <<< $(git tag -l) )"
+
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+
+  rebuild-tags:
+
+    needs: provide-tags
+
+    runs-on: ubuntu-latest
+
+    env:
+      DOCKER_HUB_ACCOUNT: bmngld
+
+    # run a dynamic matrix of builds, rebuilding and republishing provided tags
+    strategy:
+      matrix:
+        tag: ${{ fromJson(needs.provide-tags.outputs.matrix) }}
+
+    steps:
+
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ matrix.tag }}
+
+      - run: make ci
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+
+      - id: set-docker-hub
+        run: echo "::set-output name=docker-hub::$( echo $DOCKER_HUB_ACCOUNT )"
+
+      - id: set-repo-name
+        run: echo "::set-output name=repo-name::$( basename `git rev-parse --show-toplevel` )"
+
+      - id: set-docker-tag
+        run: echo "::set-output name=docker-tag::$( echo ${{ steps.set-docker-hub.outputs.docker-hub }}/${{ steps.set-repo-name.outputs.repo-name }}:${{ matrix.tag }} )"
+
+      - run: "docker tag test ${{ steps.set-docker-tag.outputs.docker-tag }}"
+
+      - run:  "echo ${{ secrets.DOCKER_HUB_TOKEN }} | docker login --username ${{ steps.set-docker-hub.outputs.docker-hub }} --password-stdin"
+
+      - run: "docker push  ${{ steps.set-docker-tag.outputs.docker-tag }}"