chore: add release infrastructure and switch to Apache-2.0

- Add version macros to zap.h (0.3.0)
- Switch license from LGPL-3.0/MIT to Apache-2.0
- Add git-cliff config for changelog generation
- Add release workflow with GitHub Release, rattler-build, and prefix.dev
- Add rattler-build recipe for prefix.dev packaging
- Update README badges and license
- Ignore markdown files (except README) and .claude directory

Author: alvgaona

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: CI
+name: ci
 
 on:
   push:

.github/workflows/release.yml

@@ -0,0 +1,89 @@
+name: release
+run-name: release ${{ github.ref_name }}
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: write
+  pull-requests: read
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        compiler: [gcc, clang]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build examples
+        run: make all CC=${{ matrix.compiler }}
+      - name: Run tests
+        run: make test CC=${{ matrix.compiler }}
+
+  release:
+    name: GitHub Release
+    needs: [test]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Verify version matches tag
+        run: |
+          TAG="${GITHUB_REF_NAME#v}"
+          HEADER=$(grep '#define ZAP_VERSION "' zap.h | sed 's/.*"\(.*\)"/\1/')
+          if [ "$TAG" != "$HEADER" ]; then
+            echo "::error::Tag $GITHUB_REF_NAME does not match zap.h version \"$HEADER\""
+            exit 1
+          fi
+      - uses: orhun/git-cliff-action@v4
+        id: changelog
+        with:
+          args: --latest
+      - name: Generate release notes
+        run: echo "${{ steps.changelog.outputs.content }}" | tail -n +2 > RELEASE_NOTES.md
+      - uses: softprops/action-gh-release@v2
+        with:
+          name: ${{ github.ref_name }}
+          body_path: RELEASE_NOTES.md
+          files: zap.h
+
+  build-package:
+    name: Build conda package
+    needs: [release]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Compute archive sha256
+        run: |
+          TAG="${GITHUB_REF_NAME}"
+          URL="https://github.com/alvgaona/zap/archive/${TAG}.tar.gz"
+          SHA=$(curl -sL "$URL" | sha256sum | cut -d' ' -f1)
+          echo "ARCHIVE_SHA256=${SHA}" >> "$GITHUB_ENV"
+      - uses: prefix-dev/rattler-build-action@v0.2.36
+        with:
+          recipe-path: recipe.yaml
+          upload-artifact: true
+
+  publish:
+    name: Publish to prefix.dev
+    needs: [build-package]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: prefix-dev/rattler-build-action@v0.2.36
+        with:
+          build-args: --help
+          setup-only: true
+      - uses: actions/download-artifact@v4
+        with:
+          path: packages
+      - name: Upload to prefix.dev
+        run: |
+          find packages -name '*.conda' -exec \
+            rattler-build upload prefix -c zap {} \;
+        env:
+          PREFIX_API_KEY: ${{ secrets.PREFIX_DEV_API_KEY }}

.gitignore

@@ -2,4 +2,11 @@
 
 # C
 build/
-CLAUDE.md
+output/
+
+# Markdown (except README)
+*.md
+!README.md
+
+# Claude
+.claude/