chore: add docker build workflow

.github/workflows/docker.yml

@@ -0,0 +1,82 @@
+name: docker-prysm
+
+on:
+  push:
+    paths:
+      - '.github/workflows/docker.yml'
+      - 'Dockerfile'
+    branches:
+      - '**'
+    tags:
+      - "v*.*.*"
+    workflow_dispatch:
+      inputs:
+        build-ref:
+          description: 'The git ref to build from'
+          type: string
+          default: ''
+          required: false
+
+env:
+  REGISTRY_IMAGE_PREFIX: ghcr.io/polymerdao/prysm
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04-16core
+    strategy:
+      fail-fast: true
+      matrix:
+        binary:
+          - beacon-chain
+          - prysmctl
+          - validator
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.inputs.build-ref }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            ${{ env.REGISTRY_IMAGE_PREFIX }}-${{ matrix.binary }}
+          tags: |
+            type=sha
+            type=semver,pattern={{raw}}
+          labels: |
+            org.opencontainers.image.source=https://github.com/polymerdao/ibc-sdk
+            org.opencontainers.image.title=prysm
+            org.opencontainers.image.url=https://github.com/polymerdao/ibc-sdk
+
+
+      - name: Authenticate Docker
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.PACKAGES_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        env:
+          REGISTRY_IMAGE: ${{ env.REGISTRY_IMAGE_PREFIX }}-${{ matrix.binary }}
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          provenance: false
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            BINARY=${{ matrix.binary }}
+            # TODO: these cause the runner to hang and crash
+            # cache-from: type=registry,ref=${{ env.REGISTRY_IMAGE }}:buildcache
+            # cache-to: type=registry,ref=${{ env.REGISTRY_IMAGE }}:buildcache,mode=max