build: add CI

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily

.github/workflows/rust-compiler-builder.yml

@@ -0,0 +1,37 @@
+name: Rust Compiler Builder
+
+on: [push]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [
+          macos-11,
+          # macos-12,
+          # macos-13,
+        ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Checkout Rust
+        uses: actions/checkout@v4
+        with:
+          repository: rust-lang/rust
+          submodules: true
+          path: rust
+
+      - name: Configure Rust
+        run: make configure
+
+      - name: Build Rust
+        run: make
+        working-directory: ./rust
+
+      - name: Install Rust
+        run: |
+          make dist
+          tree
+        working-directory: ./rust