Add actions builder

.forgejo/workflows/build.yaml

@@ -0,0 +1,49 @@
+name: Build and Push Updated Images
+run-name: Build and Push Updated Images 🚀
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - Dockerfile
+      - entrypoint.sh
+  workflow_dispatch:
+
+jobs:
+  build-image:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Login to registery
+        uses: docker/login-action@v3
+        with:
+          registry: git.oooo.nz
+          username: ${{ github.actor }}
+          password: ${{ secrets.PUSH_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5.7.0
+        with:
+          images: docker.io/library/alpine:3.22.0
+        tags: |
+          # set latest tag for default branch
+          type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3.10.0
+
+      - name: Build and push Docker image 🫙
+        id: push
+        uses: docker/build-push-action@v6.18.0
+        with:
+          context: .
+          push: true
+          tags: |
+            git.oooo.nz/alex/mdns-repeater:latest
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+          secrets: |
+            GIT_AUTH_TOKEN=${{ secrets.PUSH_TOKEN }}