ci: rework release strategy

Switch the release trigger from PR to a git tag. In practice this would
mean tagging a commit in master branch and pushing it with
`git push --tags`.

The benefit of this is that tagging is already an event that is reserved
for maintainers, so we can remove the need for verifying whether the
event was done by a maintainer.

We also no longer need to keep track of the tag. Previously the trigger
was a PR which has a different ref from the tag, so manual bookkeeping
was required to ensure github used the tag reference instead of the PR
reference. Having the tagging itself be the trigger removes this need
entirely as the default checkout will already use the tag as reference.

.github/workflows/build.yml

@@ -8,9 +8,9 @@ env:
 on:
   workflow_call:
     inputs:
-      ref:
-        default: ${{ github.ref }}
-        type: string
+      run_test:
+        default: true
+        type: boolean
 
 jobs:
   build:
@@ -71,10 +71,7 @@ jobs:
         shell: bash
 
     steps:
-    - name: Checkout source code
-      uses: actions/checkout@v4
-      with:
-        ref: ${{ inputs.ref }}
+    - uses: actions/checkout@v4
 
     - name: Read Emscripten version
       run: |
@@ -167,27 +164,27 @@ jobs:
         echo "🔗 Minimal **glibc** version required for CLI: ${min_glibc}">> $GITHUB_STEP_SUMMARY
 
     - name: Fetch fixtures
-      if: ${{ !matrix.cli-only }} # Don't fetch fixtures for only CLI building targets
+      if: ${{ !matrix.cli-only && inputs.run_test }} # Don't fetch fixtures for only CLI building targets
       run: script/fetch-fixtures
 
     - name: Generate fixtures
-      if: ${{ !matrix.cli-only }} # Can't natively run CLI on Github runner's host
+      if: ${{ !matrix.cli-only && inputs.run_test }} # Can't natively run CLI on Github runner's host
       run: script/generate-fixtures
 
     - name: Generate WASM fixtures
-      if: ${{ !matrix.cli-only && !matrix.use-cross }} # See comment for the "Build wasm library" step
+      if: ${{ !matrix.cli-only && !matrix.use-cross && inputs.run_test }} # See comment for the "Build wasm library" step
       run: script/generate-fixtures-wasm
 
     - name: Run main tests
-      if: ${{ !matrix.cli-only }} # Can't natively run CLI on Github runner's host
+      if: ${{ !matrix.cli-only && inputs.run_test }} # Can't natively run CLI on Github runner's host
       run: $BUILD_CMD test --target=${{ matrix.target }} --features=${CLI_FEATURES}
 
     - name: Run wasm tests
-      if: ${{ !matrix.cli-only && !matrix.use-cross }} # See comment for the "Build wasm library" step
+      if: ${{ !matrix.cli-only && !matrix.use-cross && inputs.run_test }} # See comment for the "Build wasm library" step
       run: script/test-wasm
 
     - name: Run benchmarks
-      if: ${{ !matrix.cli-only && !matrix.use-cross }} # Cross-compiled benchmarks make no sense
+      if: ${{ !matrix.cli-only && !matrix.use-cross && inputs.run_test }} # Cross-compiled benchmarks make no sense
       run: $BUILD_CMD bench benchmark -p tree-sitter-cli --target=${{ matrix.target }}
 
     - name: Upload CLI artifact