ci: release charms when files are changed (#36)

.github/workflows/release.yaml

@@ -6,16 +6,69 @@ on:
       - main
 
 jobs:
+  detect-region-changes:
+    name: Detect changes to maas-region charm
+    runs-on: ubuntu-latest
+    outputs:
+      any_changed: ${{ steps.echo-changes.outputs.any_changed }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Determine changed files in the commit
+        id: changed-files
+        uses: tj-actions/changed-files@v44
+        with:
+          files: |
+            maas-region/**
+      - name: Echo changed files
+        id: echo-changes
+        run: |
+          echo "Changes made: ${{ steps.changed-files.outputs.any_changed }}"
+          echo "Changed files: ${{ steps.changed-files.outputs.all_changed_files }}"
+          echo "any_changed=${{ steps.changed-files.outputs.any_changed }}" >> $GITHUB_OUTPUT
+
   release-region:
+    name: Release MAAS Region charm to edge
+    needs: detect-region-changes
+    if: needs.detect-region-changes.outputs.any_changed == 'true'
     uses: canonical/observability/.github/workflows/charm-release.yaml@main
     secrets: inherit
     with:
       charm-path: maas-region
       provider: lxd
 
+  detect-agent-changes:
+    name: Detect changes to maas-agent charm
+    needs: release-region
+    if: always() && !failure() && !cancelled()
+    runs-on: ubuntu-latest
+    outputs:
+      any_changed: ${{ steps.echo-changes.outputs.any_changed }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Determine changed files in the commit
+        id: changed-files
+        uses: tj-actions/changed-files@v44
+        with:
+          files: |
+            maas-agent/**
+      - name: Echo changed files
+        id: echo-changes
+        run: |
+          echo "Changes made: ${{ steps.changed-files.outputs.any_changed }}"
+          echo "Changed files: ${{ steps.changed-files.outputs.all_changed_files }}"
+          echo "any_changed=${{ steps.changed-files.outputs.any_changed }}" >> $GITHUB_OUTPUT
+
   release-agent:
+    name: Release MAAS Agent charm to edge
+    needs: detect-agent-changes
+    if: needs.detect-agent-changes.outputs.any_changed == 'true'
     uses: canonical/observability/.github/workflows/charm-release.yaml@main
-    needs: release-region
     secrets: inherit
     with:
       charm-path: maas-agent