ci: Add GitHub Workflow for running uncrustify

Author: jcfr

.github/workflows/format.yml

@@ -0,0 +1,63 @@
+# Syntax reference https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions
+# Environment reference https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners
+name: format
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'improve-runformat-script'
+      - 'releases/**'
+      - '1.*'
+    tags:
+      - '1.*'
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  format:
+
+    runs-on: ubuntu-22.04
+
+    defaults:
+      run:
+        shell: bash -euo pipefail {0}
+
+    env:
+      UNCRUSTIFY_INSTALL_DIR: ${{ github.workspace }}/runformat-uncrustify
+
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+
+      - name: Determine uncrustify version
+        id: get-uncrustify-version
+        run: |
+          version="$(./runformat --expected-uncrustify-version)"
+          echo "Expected uncrustify version: $version"
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+
+      - name: Set UNCRUSTIFY_VERSION env variable
+        run: |
+          version=$(./runformat --expected-uncrustify-version)
+          echo "version [$version]"
+          echo "UNCRUSTIFY_VERSION=${version}" >> "$GITHUB_ENV"
+
+      - name: Cache uncrustify
+        uses: actions/cache@v4
+        id: cache-uncrustify
+        with:
+          path: ${{ env.UNCRUSTIFY_INSTALL_DIR }}
+          key: ${{ runner.os }}-uncrustify-${{ steps.get-uncrustify-version.outputs.version }}
+
+      - name: Install uncrustify
+        if: steps.cache-uncrustify.outputs.cache-hit != 'true'
+        run: |
+          ./runformat --install --install-dir "${UNCRUSTIFY_INSTALL_DIR}"
+
+      - name: Uncrustify check
+        run: |
+          ./runformat