github: workflow: add logic to build a container image

Signed-off-by: Antoine Tenart <[email protected]>

Author: atenart

.github/workflows/build_container.yaml

@@ -0,0 +1,30 @@
+name: Build and push a container image
+
+on: [workflow_dispatch]
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+
+    permissions:
+      packages: write
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Build image
+      id: build_image
+      uses: redhat-actions/buildah-build@v2
+      with:
+        containerfiles: Containerfile
+        image: sniproxy
+        tags: "latest"
+
+    - name: Push image
+      uses: redhat-actions/push-to-registry@v2
+      with:
+        image: ${{ steps.build_image.outputs.image }}
+        tags: ${{ steps.build_image.outputs.tags }}
+        registry: ghcr.io/${{ github.repository_owner }}
+        username: ${{ github.actor }}
+        password: ${{ github.token }}

.github/workflows/daily_change_check.yaml

@@ -0,0 +1,22 @@
+name: Daily check for new commits in main
+
+on:
+  # Every day at 01:42 AM UTC.
+  schedule:
+    - cron: "42 01 * * *"
+
+jobs:
+  daily-change-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check for new commits in main and trigger actions
+        run: |
+          if [ -z "$(git log -n1 --since=yesterday --oneline)" ]; then
+              exit 0
+          fi
+          gh workflow run build_container.yaml
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}