Improve CI pipeline

Improve the CI pipeline by doing:

- Use new dtolnay runner
- Run tests using beta toolchain also
- Run formatter and linter from the CI script
  - stable: linter
  - nightly: formatter
- Run docs build with stable/nightly as required
- Add a feature matrix (not really needed now but we have an open PR
  that adds an additional feature)
- Run 32 bit tests (default features with a 32 bit target)
- Run cross tests (default features with a s390x target)

Author: tcharding

Diff for: .github/workflows/rust.yml

@@ -1,6 +1,6 @@
 on: [push, pull_request]
 
-name: Continuous Integration
+name: Continuous integration
 
 jobs:
   Stable:
@@ -17,6 +17,8 @@ jobs:
       - name: Running test script
         env:
           DO_LINT: true
+          DO_DOCS: true
+          DO_FEATURE_MATRIX: true
         run: ./contrib/test.sh
 
   Beta:
@@ -44,6 +46,7 @@ jobs:
         uses: dtolnay/rust-toolchain@nightly
       - name: Running test script
         env:
+          DO_DOCSRS: true
           DO_FMT: true
         run: ./contrib/test.sh
 
@@ -58,6 +61,8 @@ jobs:
       - name: Checkout Toolchain
         uses: dtolnay/[email protected]
       - name: Running test script
+        env:
+          DO_FEATURE_MATRIX: true
         run: ./contrib/test.sh
 
   EmbeddedWithAlloc:
@@ -92,3 +97,36 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
       - name: Run
         run: cd embedded/no-allocator && cargo rustc -- -C link-arg=-nostartfiles
+
+  Arch32bit:
+    name: Test 32-bit version
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Crate
+        uses: actions/checkout@v3
+      - name: Checkout Toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Add architecture i386
+        run: sudo dpkg --add-architecture i386
+      - name: Install i686 gcc
+        run: sudo apt-get update -y && sudo apt-get install -y gcc-multilib
+      - name: Install target
+        run: rustup target add i686-unknown-linux-gnu
+      - name: Run tests on i686
+        run: cargo test --target i686-unknown-linux-gnu
+
+  Cross:
+    name: Cross test
+    if: ${{ !github.event.act }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Crate
+        uses: actions/checkout@v3
+      - name: Checkout Toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Install target
+        run: rustup target add s390x-unknown-linux-gnu
+      - name: install cross
+        run: cargo install cross --locked
+      - name: run cross test
+        run: cross test --target s390x-unknown-linux-gnu

Diff for: contrib/test.sh

@@ -32,6 +32,21 @@ if [ "$DO_FMT" = true ]; then
     cargo fmt --check
 fi
 
+if [ "$DO_FEATURE_MATRIX" = true ]; then
+    cargo build --no-default-features
+    cargo test --no-default-features
+
+    # All features
+    cargo build --no-default-features --features="$FEATURES"
+    cargo test --no-default-features --features="$FEATURES"
+    # Single features
+    for feature in ${FEATURES}
+    do
+        cargo build --no-default-features --features="$feature"
+        cargo test --no-default-features --features="$feature"
+    done
+fi
+
 # Build the docs if told to (this only works with the nightly toolchain)
 if [ "$DO_DOCSRS" = true ]; then
     RUSTDOCFLAGS="--cfg docsrs -D warnings -D rustdoc::broken-intra-doc-links" cargo +nightly doc --all-features