add workflow to compare config

Author: YukariChiba

.github/workflows/compare.yml

@@ -0,0 +1,99 @@
+name: Compare Kernel Config
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+      - 'master'
+
+jobs:
+  genconfig:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - arch: x86_64
+            karch: x86
+          - arch: aarch64
+            karch: arm64
+          - arch: riscv64
+            karch: riscv
+          - arch: loongarch64
+            karch: loongarch
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: repo
+      - uses: actions/checkout@v4
+        with:
+          ref: master
+          path: repo-old
+      - uses: actions/checkout@v4
+        with:
+          repository: eweOS/packages
+          ref: linux
+          path: pkg
+      - run: >-
+            docker run
+            --rm
+            -v $(pwd):/${{ github.workspace }}
+            -w ${{ github.workspace }}
+            ghcr.io/eweos/docker:buildenv
+            bash -c "
+            pushd pkg &&
+            pacman -Syu --noconfirm && makepkg -os --noconfirm &&
+            kdir=pkg/src/\$(source PKGBUILD && echo \$_basename-\$pkgver) &&
+            popd &&
+            repo/scripts/generate-config.sh ${{ matrix.arch }} ${{ matrix.karch }} \$kdir &&
+            cp \$kdir/.config config-new &&
+            repo-old/scripts/generate-config.sh ${{ matrix.arch }} ${{ matrix.karch }} \$kdir &&
+            cp \$kdir/.config config-old &&
+            diff -urN config-old config-new > config.diff || true
+            "
+      - uses: actions/upload-artifact@v4
+        with:
+          name: diff-${{ matrix.arch }}
+          path: config.diff
+
+  compare:
+    runs-on: ubuntu-latest
+    needs: [genconfig]
+    steps:
+      - uses: peter-evans/find-comment@v3
+        id: fc
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'github-actions[bot]'
+          body-includes: '## Config Compare'
+      - uses: actions/download-artifact@v4
+        with:
+          name: diff-x86_64
+          path: diff-x86_64
+      - uses: actions/download-artifact@v4
+        with:
+          name: diff-aarch64
+          path: diff-aarch64
+      - uses: actions/download-artifact@v4
+        with:
+          name: diff-riscv64
+          path: diff-riscv64
+      - uses: actions/download-artifact@v4
+        with:
+          name: diff-loongarch64
+          path: diff-loongarch64
+      - run: >-
+          echo "## Config Compare" >> diff.output &&
+          for outarch in x86_64 aarch64 riscv64 loongarch64; do
+          (echo "## $outarch" >> diff.output &&
+          echo '```diff' >> diff.output &&
+          echo "diff for $outarch" >> diff.output &&
+          cat diff-$outarch/config.diff >> diff.output &&
+          echo '```' >> diff.output);
+          done
+      - uses: peter-evans/create-or-update-comment@v4
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          issue-number: ${{ github.event.pull_request.number }}
+          body-path: diff.output
+          edit-mode: replace