ci: Add container image workflow

.github/workflows/image.yml

@@ -0,0 +1,75 @@
+name: image
+
+permissions:
+  packages: write
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - 'v*'
+    paths-ignore:
+      - 'docs/**'
+      - '**.adoc'
+      - '**.md'
+      - 'LICENSE'
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - 'docs/**'
+      - '**.adoc'
+      - '**.md'
+      - 'LICENSE'
+
+jobs:
+  buildx:
+    if: github.repository_owner == 'astefanutti'
+    name: buildx
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        with:
+          platforms: arm64
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            ghcr.io/${{ github.repository_owner }}/decktape
+          tags: |
+            type=ref,event=branch
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+          cache-from: type=gha,scope=${{ github.ref_name }}
+          cache-to: type=gha,scope=${{ github.ref_name }},mode=max
+          provenance: false