Cache builds in CI

.github/scripts/plan.js

@@ -33,20 +33,24 @@ const allModes = {
     name: "clippy",
     cargoCommand: "clippy",
     cargoArgs: "--all-targets -- -D warnings",
+    cargoCacheKey: "clippy",
   },
   test: {
     name: "test",
     cargoCommand: "test",
+    cargoCacheKey: "test",
   },
   build: {
     name: "build",
     cargoCommand: "build",
+    cargoCacheKey: "build",
   },
   fmt: {
     name: "fmt",
     cargoCommand: "fmt",
     cargoArgs: "-- --check",
-    platformIndependent: true
+    platformIndependent: true,
+    cargoCacheKey: "code",
   }
 };
 

.github/workflows/code.yml

@@ -9,6 +9,9 @@ defaults:
   run:
     shell: bash
 
+env:
+  CARGO_INCREMENTAL: "0"
+
 jobs:
 
   cancel-previous:
@@ -61,6 +64,13 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
+      - name: Cache rustup
+        uses: actions/cache@v2
+        with:
+          path: |
+            /usr/share/rust/.rustup
+          key: ${{ runner.os }}-rustup-${{ hashFiles('rust-toolchain.toml') }}
+
       - name: Install rust toolchain
         run: rustup show
 
@@ -78,6 +88,17 @@ jobs:
           cargo clippy --version
           env
 
+      - name: Cache cargo
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ matrix.mode.cargoCacheKey }}-${{ hashFiles('rust-toolchain.toml', 'Cargo.lock') }}
+
       - name: Run cargo ${{ matrix.mode.cargoCommand }}
         uses: actions-rs/cargo@v1
         with: