Add Forgejo Actions workflow to build and push image

.forgejo/workflows/build.yml

@@ -0,0 +1,36 @@
+name: Build and push container image
+
+on:
+  push:
+    branches: [main]
+
+env:
+  IMAGE: git.workaround.org/chaas/vector-search
+
+jobs:
+  build-and-push:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Forgejo registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.workaround.org
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.FORGEJO_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          build-args: |
+            SOURCE_COMMIT=${{ github.sha }}
+          tags: |
+            ${{ env.IMAGE }}:latest
+            ${{ env.IMAGE }}:${{ github.sha }}