Add GitHub Actions workflow

.github/workflows/test.yml

@@ -0,0 +1,36 @@
+on:
+  - push
+
+jobs:
+  test:
+    name: Run tests
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Check formatting
+        run: cargo fmt -- --check
+      - name: Check database schema
+        run: make check-db-schema
+      - name: Check Clippy
+        run: cargo clippy --all -- -Dwarnings
+      - name: Run tests
+        run: cargo test --all
+  push:
+    if: github.ref == 'refs/heads/main' && github.repository == 'brioche-dev/brioche'
+    needs: test
+    name: Push artifacts
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Build Brioche
+        run: cargo build --release
+      - name: Build brioche-pack
+        run: |
+          cargo +nightly build \
+            -p brioche-pack \
+            --profile=release-tiny \
+            --target=x86_64-unknown-linux-musl \
+            -Z 'build-std=std,panic_abort' \
+            -Z 'build-std-features=panic_immediate_abort'