Add github workflow

.github/dependabot.yaml

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

.github/release.yaml

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+changelog:
+  exclude:
+    labels:
+      - ignore-for-release
+    authors:
+      - dependabot 
+  categories:
+    - title: Breaking Changes 🛠
+      labels:
+        - semver-major
+        - breaking-change
+    - title: New Features 🎉
+      labels:
+        - semver-minor
+        - enhancement
+    - title: Other Changes
+      labels:
+        - '*'

.github/workflows/build.yaml

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+name: Build
+on: [push]
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [windows-2022, macos-14, ubuntu-22.04]
+        addrsize: ["64"]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: AlchemyViewer/action-autobuild@v4
+        with:
+          addrsize: ${{ matrix.addrsize }}
+          build-variables-repo: alchemyviewer/build-variables
+          build-variables-ref: alchemy
+          apt-packages: autoconf automake autopoint gettext
+          brew-packages: ninja
+  release:
+    needs: build
+    runs-on: [ubuntu-latest]
+    if: startsWith(github.ref, 'refs/tags/v')
+    steps:
+      - uses: alchemyviewer/action-autobuild-release@v4
+        with:
+          public: true

README.md

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+# 3p-libxml2
+
+[Autobuild][] packaged [libxml2][].
+
+[Autobuild]: https://github.com/secondlife/autobuild
+[libxml2]: https://gitlab.gnome.org/GNOME/libxml2/-/releases