chore: Add GitHub Actions

.github/workflows/build.yml

@@ -0,0 +1,34 @@
+name: Build with cargo
+
+on: [push, pull_request]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Cache build artifacts
+        uses: actions/cache@v2
+        with:
+          path: target/**
+          key: ${{ runner.os }}-cargo
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - name: Build with cargo
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --release
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: gitit
+          path: target/release/gitit