Build and push container to ghcr

.github/workflows/build-container.yml

@@ -0,0 +1,42 @@
+name: Build Container
+
+on:
+  push:
+    branches:
+      - bikeshed-builds
+    paths:
+      - 'build-tools/**'
+      - '.github/workflows/build-container.yml'
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Build and push
+      uses: docker/build-push-action@v6
+      with:
+        platforms: linux/amd64,linux/arm64
+        push: true
+        tags: |
+          ghcr.io/dash-industry-forum/dashif-specs:latest