Merge pull request #3 from SMI/rkm

Only rebuild containers if files changed

.github/workflows/main.yaml

@@ -21,7 +21,19 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+      - name: skip if unchanged
+        run: |
+          set -euxo pipefail
+          SKIP=0
+          if ! git diff --name-only HEAD^ | grep "software/${{ matrix.package }}" | grep -v README > /dev/null
+          then
+            SKIP=1
+          fi
+          echo "SKIP=$SKIP" >> "$GITHUB_ENV"
       - name: free disk space
+        if: env.SKIP == '0'
         run: |
           set -euxo pipefail
           df -h
@@ -33,6 +45,7 @@ jobs:
           sudo docker image prune --all --force
           df -h
       - name: build image
+        if: env.SKIP == '0'
         run: |
           set -euxo pipefail
           package="${{ matrix.package }}"
@@ -44,7 +57,7 @@ jobs:
           echo "img=$img" >> "$GITHUB_ENV"
           echo "tag=$tag" >> "$GITHUB_ENV"
       - name: push image
-        if: github.ref == 'refs/heads/main'
+        if: env.SKIP == '0' && github.ref == 'refs/heads/main'
         run: |
           set -euxo pipefail
           echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u $ --password-stdin