feat(ci): run rustfmt, cargo test, cargo build (and do cross-build/cross-testing)

Author: klardotsh

.github/workflows/build.yml

@@ -0,0 +1,45 @@
+on:
+  - push
+name: build::linux
+jobs:
+  build_linux_x86_64_musl:
+    name: x86_64-musl
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.58.0 # keep in sync with MSRV in README.md/Cargo.toml
+          target: x86_64-unknown-linux-musl
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: test
+          args: --target x86_64-unknown-linux-musl
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: build --release
+          args: --target x86_64-unknown-linux-musl
+
+  build_linux_aarch64_musl:
+    name: aarch64-musl
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.58.0 # keep in sync with MSRV in README.md/Cargo.toml
+          target: aarch64-unknown-linux-musl
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: test
+          args: --target aarch64-unknown-linux-musl
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: build --release
+          args: --target aarch64-unknown-linux-musl

.github/workflows/lint.yml

@@ -1,13 +1,35 @@
-on: push
-name: Clippy
+on:
+  - push
+name: lint
 jobs:
-  clippy_check:
+  clippy:
+    name: clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
-      - run: rustup install 1.58.0 # keep in sync with MSRV in README.md/Cargo.toml
-      - run: rustup component add clippy
-      - uses: actions-rs/clippy-check@v1
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all-features
+          profile: minimal
+          toolchain: 1.58.0 # keep in sync with MSRV in README.md/Cargo.toml
+          override: true
+          components: rustfmt, clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+
+  rustfmt:
+    name: rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: 1.58.0 # keep in sync with MSRV in README.md/Cargo.toml
+          override: true
+          components: rustfmt, clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check