initial commit of workflows

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly

.github/workflows/build-multiarch.yaml

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+name: Build and push multi-arch images
+
+on:
+  workflow_dispatch:
+    inputs:
+      gitRef:
+        description: Commit, tag or branch name to deploy
+        required: true
+        type: string
+        default: main
+      pushToRegistry:
+        description: Push to image registry. Set to false to build without pushing.
+        required: true
+        type: boolean
+        default: true
+  # push:
+  #   branches:
+  #     - main
+  # schedule:
+  #   - cron: '34 3 * * *'
+
+env:
+  REGISTRY_BASE: ghcr.io/publishing-platform
+
+jobs:
+  configure_builds:
+    name: Read configuration from build-matrix.json
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+      matrix_versions: ${{ steps.set-matrix.outputs.matrix_versions }}
+      runs_on: ${{ steps.set-matrix.outputs.runs_on }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+      - id: set-matrix
+        run: |
+          {
+            echo "matrix=$(jq -c . < build-matrix.json)"
+            echo "matrix_versions=$(jq -c .version < build-matrix.json)"
+            echo "runs_on=$(jq -c .runs_on < build-matrix.json)"
+          } >> "$GITHUB_OUTPUT"  

.github/workflows/lint.yaml

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+name: Run linters/fixers
+on: [push]
+jobs:
+  shellcheck:
+    name: Shellcheck
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        show-progress: false
+    - name: Run ShellCheck
+      uses: ludeeus/action-shellcheck@00cae500b08a931fb5698e11e79bfbd38e612a38  # 2.0.0
+  hadolint:
+    name: Hadolint
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        show-progress: false
+    - uses: jbergstroem/hadolint-gh-action@eac45b98f6d761309202bd201205a8f8c988bfad  # v1.11.0
+      with:
+        dockerfile: '**/*Dockerfile'
+        error_level: '1'  # Fail on warning or above.

build-matrix.json

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+{
+  "version": [
+      {
+          "rubyver": [
+              "3", "2", "4"
+          ],
+          "checksum": "c72b3c5c30482dca18b0f868c9075f3f47d8168eaf626d4e682ce5b59c858692",
+          "extra": ""
+      }
+  ],
+  "runs_on": [
+      {
+          "runner_type": "ubuntu-latest",
+          "arch": "amd64"
+      },
+      {
+          "runner_type": "ubuntu-24.04-arm",
+          "arch": "arm64"
+      }
+  ]
+}