Add docker container flows

.github/workflows/docker-build.yml

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+name: Docker
+
+# Trigger on pushes to master branch, new semantic version tags, and pull request updates
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+--.*"
+      - "v[0-9]+.[0-9]+.[0-9]+-alpha.[0-9]+--.*"
+      - "v[0-9]+.[0-9]+.[0-9]+-beta.[0-9]+--.*"
+      - "v[0-9]+.[0-9]+.[0-9]+-rc[0-9]+--.*"
+  # trigger on pull request updates when target is `main` branch
+  pull_request:
+    branches:
+      - "main"
+
+jobs:
+  conductor:
+    uses: './.github/workflows/reusable-docker-build.yml'
+    with:
+      package-name: conductor
+      dockerfile: crates/astria-conductor/Dockerfile
+
+  sequencer-relayer:
+    uses: './.github/workflows/reusable-docker-build.yml'
+    with:
+      package-name: sequencer-relayer
+      dockerfile: crates/astria-sequencer-relayer/Dockerfile

.github/workflows/reusable-docker-build.yml

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+name: Reusable Docker Build && Push Workflow
+
+on:
+  workflow_call:
+    inputs:
+      package-name:
+        required: true
+        type: string
+      dockerfile:
+        required: true
+        type: string
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    if: ${{ contains(github.ref, 'refs/tags/v') && contains(github.ref, format('--{0}', inputs.package-name)) || github.ref == 'refs/heads/main' || github.event_name == 'pull_request' }}
+    steps:
+      # Checking out the repo
+      - uses: actions/checkout@v3
+      # https://github.com/docker/setup-qemu-action
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Log in to registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      # Generate correct tabs and labels
+      - name: Docker metadata
+        id: metadata
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ format('ghcr.io/astriaorg/{0}', inputs.package-name) }}
+          tags: |
+            type=ref,event=pr
+            type=semver,pattern={{major}}.{{minor}}.{{patch}}
+            type=sha
+            # set latest tag for `main` branch
+            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          # this gets rid of the unknown/unknown image that is created without this setting
+          # https://github.com/docker/build-push-action/issues/820#issuecomment-1455687416
+          provenance: false
+          context: .
+          file: ${{ inputs.dockerfile }}
+          platforms: 'linux/amd64,linux/arm64'
+          push: true
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}
+