Create build.yml

.github/workflows/build.yml

@@ -0,0 +1,47 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch: # Allow manual triggering of the workflow from the GitHub Actions interface
+
+# Cancel previous runs if a new commit is pushed to the same PR or branch
+concurrency:
+  group: ${{ github.ref }}  # Group runs by the ref (branch or PR)
+  cancel-in-progress: true  # Cancel any ongoing runs in the same group
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages and modify PR labels
+permissions:
+  contents: read          # Read access to repository contents
+  pages: write            # Write access to GitHub Pages
+  id-token: write         # Write access to ID tokens
+
+jobs:
+  build_project:
+    runs-on: ubuntu-latest
+    name: Build project
+    steps:
+      - name: Checkout project
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Fetch all history for all branches and tags
+
+      - name: Install elan
+        run: curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf | sh -s -- -y
+
+      - name: Get Mathlib cache
+        run: ~/.elan/bin/lake exe cache get || true
+
+      - name: Cache build artifacts
+        uses: actions/cache@v4
+        with:
+          path: |
+            .lake/build
+          key: LakeBuild-${{ runner.os }}-${{ hashFiles('lean-toolchain') }}-${{ hashFiles('lake-manifest.json') }}
+
+      - name: Build project
+        run: ~/.elan/bin/lake build Project