feat: Enable building container and pushing it

Author: jiilaa

.github/workflows/docker-publish.yml

@@ -0,0 +1,64 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [ main ]
+    tags: [ 'v*.*.*' ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: ${{ secrets.DOCKERHUB_USERNAME }}/ruuvicore
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            # Development tag from main branch
+            type=raw,value=dev,enable={{is_default_branch}}
+            # Version tags from git tags (v1.2.3 -> 1.2.3, 1.2)
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            # Latest tag only on version tags
+            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+          flavor: |
+            latest=false
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile.crosscompile
+          platforms: linux/arm/v7
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Image digest
+        run: echo ${{ steps.build.outputs.digest }}