Build arch specific images

.github/workflows/CD.yml

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+# This workflow will upload a docker image
+# to https://hub.docker.com/repository/docker/twindb/omnibus-ubuntu
+---
+name: Continuous Deployment
+
+on:  # yamllint disable-line rule:truthy
+    push:
+        branches: ["focal"]
+jobs:
+    push_to_registry:
+        name: "Push Docker image to Docker Hub"
+        runs-on: ${{matrix.os}}
+        strategy:
+            matrix:
+                os: ["ubuntu-latest"]
+        steps:
+            - name: Check out the repo
+              uses: actions/checkout@v4
+
+            # Credit https://stackoverflow.com/a/58035262
+            - name: Extract branch name
+              shell: bash
+              run: echo "branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT
+              id: extract_branch
+
+            - name: "Log in to Docker Hub"
+              uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a
+              with:
+                  username: ${{ secrets.DOCKER_USERNAME }}
+                  password: ${{ secrets.DOCKER_PASSWORD }}
+
+            - name: "Build and push the image"
+              run: |
+                ARCH=$(uname -m)
+                docker build -t twindb/omnibus-ubuntu:${{ steps.extract_branch.outputs.branch }}-${ARCH} .
+                docker build -t twindb/omnibus-ubuntu:${{ steps.extract_branch.outputs.branch }} .
+                docker push twindb/omnibus-ubuntu:${{ steps.extract_branch.outputs.branch }}-${ARCH}
+                docker push twindb/omnibus-ubuntu:${{ steps.extract_branch.outputs.branch }}

.yamllint

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+---
+extends: default
+
+rules:
+  line-length:
+    max: 120
+    level: warning
+...