Added arm64 support to image

- Modified Dockerfile to cross-compilate to x86_64 and arm64
- Modified build-push.yml workflow and changed conditions to run workflow
- Modified build-push.yml workflow to build form x86_64 and arm64
- Modified build-push.yml workflow cache and push to GitHub's Container Registry
- Modified build-push.yml workflow and added build step to  login to GitHub's Container Registry
- Modified build-push.yml workflow and added build step to generate image metadata
- Modified build-push.yml workflow docker/build-push-action step to v5

.github/workflows/build-push.yml

@@ -1,34 +1,70 @@
-name: Build and push to repository
+name: Build and push to registry
 
 on:
   push:
-    branches: [ "main" ]
+    branches: [ "main", "dev" ]
+    tags: [ "v*.*.*" ]
+  pull_request:
+    branches: [ "main", "dev" ]
+  workflow_dispatch:
+
+permissions:
+  packages: write
 
 jobs:
   build-and-push:
-    name: Build Docker image and push to repository
+    name: Build Docker image and push to registry
     runs-on: ubuntu-latest
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
-        
+
       - name: Set up Docker buildx
         id: buildx
         uses: docker/setup-buildx-action@v2
-        
-      - name: Login to repository
+
+      - name: Login to private registry
         uses: docker/login-action@v2
         with:
           registry: ${{ secrets.REGISTRY_URL }}
           username: ${{ secrets.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
-        
+
+      - name: Login to GitHub's container registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Generate image metadata
+        id: spoticord # used in next step
+        uses: docker/metadata-action@v5
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            ghcr.io/spoticord/spoticord
+            ${{ secrets.REGISTRY_URL }}/spoticord/spoticord
+          # Docker tags based on the following events/attributes
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+
       - name: Build image and push to registry
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: .
-          file: ./Dockerfile
-          tags: |
-            ${{ secrets.REGISTRY_URL }}/spoticord/spoticord:latest
-          push: ${{ github.ref == 'refs/heads/main' }}
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.spoticord.outputs.tags }}
+          labels: ${{ steps.spoticord.outputs.labels }}
+          # Some basic caching of the layers...
+          cache-from: ghcr.io/spoticord/spoticord:latest-cache
+          cache-to: ghcr.io/spoticord/spoticord:latest-cache