ci: add container build workflow

Removes prior workflows that used by the upstream project repo.
Creates a new container build workflow.

.github/workflows/container.yml

@@ -0,0 +1,62 @@
+---
+name: Build container image
+on:
+  workflow_call:
+  workflow_dispatch:
+    inputs:
+      penumbra_version:
+        description: 'Git ref (e.g. branch or tag) of Penumbra repo for building'
+        default: "main"
+        required: true
+  push:
+    branches:
+      - main
+    tags:
+      - '**'
+jobs:
+  hermes:
+    runs-on: buildjet-16vcpu-ubuntu-2004
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Docker Hub container registry (for pulls)
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Log in to the GitHub container registry (for pushes)
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/penumbra-zone/hermes
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64
+          file: ci/release/Containerfile
+          push: true
+          # We include a tag with the associated Penumbra, e.g. `penumbra-v0.61.0`.
+          # This is important to maintain compatibility with a long-running testnet.
+          tags: ${{ steps.meta.outputs.tags }},ghcr.io/penumbra-zone/hermes:penumbra-${{ github.event.inputs.penumbra_version || 'main' }}
+          build-args: |
+            PENUMBRA_VERSION=${{ github.event.inputs.penumbra_version || 'main' }}
+          # We disable layer caching to ensure that the most recent penumbra repo is used.
+          # Otherwise, the static git url for the repo will always result in a cache hit.
+          # TODO: update with dynamic build-args using e.g. current date to bust cache.
+          no-cache: true
+          labels: ${{ steps.meta.outputs.labels }}