CI: Replace deprecated actions-rs with simple run: cargo ... (#720)

There's no reason to use these steps anymore: besides being old,
unmaintained, and spitting out NodeJS deprecation warnings, GitHub's
`runner-images` come preloaded with all Rust tools and components we
need, and the syntax to run commands is more efficient, much shorter and
more apprehensible by simply matching what we'd use on our own
command-line, too.

.github/workflows/ci.yml

@@ -8,15 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - uses: actions-rs/toolchain@v1
+      - run: cargo check --workspace --all-targets --all-features
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: check
-          args: --workspace --all-targets --all-features
 
   check_msrv:
     name: Check ash MSRV (1.59.0)
@@ -24,10 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - uses: dtolnay/rust-toolchain@1.59.0
-      - uses: actions-rs/cargo@v1
+      - run: cargo check -p ash --all-features
-        with:
-          command: check
-          args: -p ash --all-features
 
   check_ash_window_msrv:
     name: Check ash-window MSRV (1.64.0)
@@ -35,10 +24,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - uses: dtolnay/rust-toolchain@1.64.0
-      - uses: actions-rs/cargo@v1
+      - run: cargo check -p ash-window -p examples --all-features
-        with:
-          command: check
-          args: -p ash-window -p examples --all-features
 
   generated:
     name: Generated
@@ -47,21 +33,10 @@ jobs:
       - uses: actions/checkout@v1
         with:
           submodules: true
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
       - name: Run generator
-        uses: actions-rs/cargo@v1
+        run: cargo run -p generator
-        with:
-          command: run
-          args: -p generator
       - name: Format generated results
-        uses: actions-rs/cargo@v1
+        run: cargo fmt -p ash
-        with:
-          command: fmt
-          args: -p ash
       - name: Diff autogen result
         run: git diff --quiet || (echo "::error::Generated files are different, please regenerate with cargo run -p generator!"; git diff; false)
 
@@ -72,82 +47,39 @@ jobs:
       - name: Install Vulkan loader
         run: sudo apt-get install libvulkan-dev
       - uses: actions/checkout@v1
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
       - name: Test all targets
-        uses: actions-rs/cargo@v1
+        run: cargo test --workspace --all-targets
-        with:
-          command: test
-          args: --workspace --all-targets
       - name: Test docs
-        uses: actions-rs/cargo@v1
+        run: cargo test --workspace --doc
-        with:
-          command: test
-          args: --workspace --doc
 
   fmt:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - uses: actions-rs/toolchain@v1
+      - run: cargo fmt --all -- --check
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-          components: rustfmt
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all -- --check
 
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - uses: actions-rs/toolchain@v1
+      - name: Clippy lint without features
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-          components: clippy
-      - uses: actions-rs/cargo@v1
-        name: Clippy lint without features
-        with:
-          command: clippy
         # Only test the core ash and ash-window crate, where features reside.
         # The examples crate would otherwise enable all default features again,
         # making this test moot.
-          args: -p ash -p ash-window --no-default-features -- -D warnings
+        run: cargo clippy -p ash -p ash-window --no-default-features -- -D warnings
-      - uses: actions-rs/cargo@v1
+      - name: Clippy lint with all features
-        name: Clippy lint with all features
+        run: cargo clippy --workspace --all-targets --all-features -- -D warnings
-        with:
+      - name: Clippy lint with default features
-          command: clippy
+        run: cargo clippy --workspace --all-targets -- -D warnings
-          args: --workspace --all-targets --all-features -- -D warnings
-      - uses: actions-rs/cargo@v1
-        name: Clippy lint with default features
-        with:
-          command: clippy
-          args: --workspace --all-targets -- -D warnings
 
   docs:
     name: Build-test docs
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
+      - name: Document all crates
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - uses: actions-rs/cargo@v1
-        name: Document all crates
         env:
           RUSTDOCFLAGS: -Dwarnings
-        with:
+        run: cargo doc --all --all-features --no-deps --document-private-items
-          command: doc
-          args: --all --all-features --no-deps --document-private-items