improve build time in CI

.github/workflows/main.yml

@@ -11,12 +11,20 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
       - run: rustup component add clippy
       - uses: actions-rs/clippy-check@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --all-features
-      - run: cargo install cargo-when
       - name: Build
         run: ./build.sh
       - name: Run tests
@@ -27,10 +35,18 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: recursive
+      - uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
-      - run: cargo install cargo-when
       - name: Build
         run: ./build.sh
       - uses: actions/setup-go@v2

README.md

@@ -42,10 +42,6 @@ For other platforms, please use the devcontainer that we prepared.
 
 ## Building
 
-```sh
-$ cargo install cargo-when # installs prerequisite for building youki
-```
-
 ```sh
 $ git clone git@github.com:containers/youki.git
 $ cd youki

build.sh

@@ -8,8 +8,7 @@ VERSION=debug
 if [[ "$1" == "--release" ]]; then
     VERSION=release
 fi
-cargo when --channel=stable build --verbose $TGT $1 && \
-cargo when --channel=beta build --verbose $TGT $1 && \
-cargo when --channel=nightly build --verbose --features nightly $TGT $1 && \
+
+cargo build --verbose $TGT $1
 rm -f youki
 cp target/$TARGET/$VERSION/youki .