feat: rewrite release system to support multiple images per commit

A critical limitation of the first design was the assumption that there would only be one Docker build per commit.  As such, software packages were often only refreshed when Zephyr was upgraded.

This new design opens the door to better CI practices.  It allows regular rebuilds of the Docker images irrespective of version control.  This is critical for incorporating the latest security fixes and bug patches as soon as possible.

Maintainers are still required to trigger stable releases (via tags), but this can be revisited in the future if further automation is necessary.

PR: #50

.github/workflows/containers.yml

@@ -3,6 +3,7 @@ name: Containers
 env:
   zephyr-version: 2.4.0
   zephyr-sdk-version: 0.11.4
+  sha-abbrev-length: 12
   no-cache: ${{ github.event_name == 'workflow_dispatch' || github.event_name == 'schedule' }}
   run-unit-tests: ${{ secrets.RUN_UNIT_TESTS != null }}
   docker-hub-credentials: ${{ secrets.DOCKER_HUB_USERNAME != null && secrets.DOCKER_HUB_TOKEN != null }}
@@ -47,25 +48,26 @@ jobs:
       versions: ${{ steps.definitions.outputs.versions }} # e.g. 2.4.0-0.11.4
       major-minor: ${{ steps.definitions.outputs.major-minor }} # e.g. 2.4
       major-minor-branch: ${{ steps.definitions.outputs.major-minor-branch }} # e.g. 2.4-branch
-      release-trigger: ${{ steps.definitions.outputs.release-trigger }}
     steps:
       - name: Definitions
         id: definitions
         env:
           SHA: ${{ github.sha }}
+          SHA_ABBREV_LENGTH: ${{ env.sha-abbrev-length }}
+          RUN_ID: ${{ github.run_id }}
           ZEPHYR_VERSION: ${{ env.zephyr-version }}
           ZEPHYR_SDK_VERSION: ${{ env.zephyr-sdk-version }}
         run: |
           BRANCH=${GITHUB_REF#refs/heads/}
           BRANCH=${BRANCH//[^A-Za-z0-9_.-]/_} # Substitutes invalid Docker tag characters
           BASE=${GITHUB_BASE_REF//[^A-Za-z0-9_.-]/_} # Substitutes invalid Docker tag characters
-          CANDIDATE=${SHA}
+          SHA=${SHA:0:${SHA_ABBREV_LENGTH}}
+          CANDIDATE=${BRANCH}-$(date +%Y%m%d%H%M%S)-${ZEPHYR_VERSION}-${ZEPHYR_SDK_VERSION}-${SHA}-${RUN_ID}
           VERSIONS=${ZEPHYR_VERSION}-${ZEPHYR_SDK_VERSION}
           MAJOR=$(echo ${ZEPHYR_VERSION} | cut -d'.' -f 1)
           MINOR=$(echo ${ZEPHYR_VERSION} | cut -d'.' -f 2)
           MAJOR_MINOR=${MAJOR}.${MINOR}
           MAJOR_MINOR_BRANCH=${MAJOR_MINOR}-branch
-          RELEASE_TRIGGER=${ZEPHYR_VERSION}-${ZEPHYR_SDK_VERSION}
 
           echo ::set-output name=branch::${BRANCH}
           echo ::set-output name=base::${BASE}
@@ -73,7 +75,6 @@ jobs:
           echo ::set-output name=versions::${VERSIONS}
           echo ::set-output name=major-minor::${MAJOR_MINOR}
           echo ::set-output name=major-minor-branch::${MAJOR_MINOR_BRANCH}
-          echo ::set-output name=release-trigger::${RELEASE_TRIGGER}
   dev-generic:
     needs:
       - tags
@@ -404,11 +405,76 @@ jobs:
           docker image push ${{ steps.paths.outputs.build-branch }}
           docker image push ${{ steps.paths.outputs.dev-candidate }}
           docker image push ${{ steps.paths.outputs.dev-branch }}
+  release-trigger:
+    if: ${{ startsWith(github.ref, 'refs/tags') }}
+    runs-on: ubuntu-latest
+    outputs:
+      tag: ${{ steps.match.outputs.tag }}
+      branch: ${{ steps.match.outputs.branch }}
+      datetime: ${{ steps.match.outputs.datetime }}
+      date: ${{ steps.match.outputs.date }}
+      year: ${{ steps.match.outputs.year }}
+      month: ${{ steps.match.outputs.month }}
+      day: ${{ steps.match.outputs.day }}
+      time: ${{ steps.match.outputs.time }}
+      hour: ${{ steps.match.outputs.hour }}
+      minute: ${{ steps.match.outputs.minute }}
+      second: ${{ steps.match.outputs.second }}
+      zephyr-version: ${{ steps.match.outputs.zephyr-version }}
+      zephyr-version-major: ${{ steps.match.outputs.zephyr-version-major }}
+      zephyr-version-minor: ${{ steps.match.outputs.zephyr-version-minor }}
+      zephyr-version-patch: ${{ steps.match.outputs.zephyr-version-patch }}
+      zephyr-sdk-version: ${{ steps.match.outputs.zephyr-sdk-version }}
+      zephyr-sdk-version-major: ${{ steps.match.outputs.zephyr-sdk-version-major }}
+      zephyr-sdk-version-minor: ${{ steps.match.outputs.zephyr-sdk-version-minor }}
+      zephyr-sdk-version-patch: ${{ steps.match.outputs.zephyr-sdk-version-patch }}
+      sha: ${{ steps.match.outputs.sha }}
+      run-id: ${{ steps.match.outputs.run-id }}
+    steps:
+      - name: Is tag a release trigger?
+        id: match
+        run: |
+          TAG=${GITHUB_REF#refs/tags/}
+          PATTERN="^(.+?)-((([0-9]{4})(0[1-9]|1[012])(0[1-9]|[12][0-9]|3[01]))(([01]?[0-9]|2[0-3])([0-5][0-9])([0-5][0-9])))-(([0-9]+)\.([0-9]+)\.([0-9]+))-(([0-9]+)\.([0-9]+)\.([0-9]+))-([0-9a-fA-F]+)-([0-9]+)$"
+          if [[ "${TAG}" =~ $PATTERN ]]; then
+            echo ::set-output name=tag::${TAG}
+            echo ::set-output name=branch::${BASH_REMATCH[1]}
+            echo ::set-output name=datetime::${BASH_REMATCH[2]}
+            echo ::set-output name=date::${BASH_REMATCH[3]}
+            echo ::set-output name=year::${BASH_REMATCH[4]}
+            echo ::set-output name=month::${BASH_REMATCH[5]}
+            echo ::set-output name=day::${BASH_REMATCH[6]}
+            echo ::set-output name=time::${BASH_REMATCH[7]}
+            echo ::set-output name=hour::${BASH_REMATCH[8]}
+            echo ::set-output name=minute::${BASH_REMATCH[9]}
+            echo ::set-output name=second::${BASH_REMATCH[10]}
+            echo ::set-output name=zephyr-version::${BASH_REMATCH[11]}
+            echo ::set-output name=zephyr-version-major::${BASH_REMATCH[12]}
+            echo ::set-output name=zephyr-version-minor::${BASH_REMATCH[13]}
+            echo ::set-output name=zephyr-version-patch::${BASH_REMATCH[14]}
+            echo ::set-output name=zephyr-sdk-version::${BASH_REMATCH[15]}
+            echo ::set-output name=zephyr-sdk-version-major::${BASH_REMATCH[16]}
+            echo ::set-output name=zephyr-sdk-version-minor::${BASH_REMATCH[17]}
+            echo ::set-output name=zephyr-sdk-version-patch::${BASH_REMATCH[18]}
+            SHA=${BASH_REMATCH[19]}
+            echo ::set-output name=sha::${SHA}
+            echo ::set-output name=run-id::${BASH_REMATCH[20]}
+
+            if [[ "${{ github.sha }}" != ${SHA}* ]]; then
+              echo "Hashes do not match!"
+              echo "${{ github.sha }}"
+              echo "${SHA}"
+              exit 1
+            fi
+          else
+            echo "Tag not recognised, ignoring ..."
+          fi
   releases:
     needs:
       - architectures
       - tags
-    if: ${{ github.ref == format('refs/tags/{0}', needs.tags.outputs.release-trigger) }}
+      - release-trigger
+    if: ${{ needs.release-trigger.outputs.sha != null }}
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -436,7 +502,7 @@ jobs:
           GHCRNS: ${{ env.ghcr-namespace }}
           TARGET: ${{ matrix.target }}
           ARCHITECTURE: ${{ matrix.architecture }}
-          CANDIDATE: ${{ needs.tags.outputs.candidate }}
+          CANDIDATE: ${{ needs.release-trigger.outputs.tag }}
           VERSIONS: ${{ needs.tags.outputs.versions }}
           MAJOR_MINOR: ${{ needs.tags.outputs.major-minor }}
         run: |