Use GHA instead of Travis for CI

Author: eldruin

.github/workflows/ci.yml

@@ -0,0 +1,49 @@
+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Continuous integration
+
+jobs:
+  ci-linux:
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental || false }}
+    strategy:
+      matrix:
+        # All published crates must build on stable.
+        rust: [stable, beta, 1.31.0]
+
+        # The default target we're compiling on and for.
+        TARGET: [x86_64-unknown-linux-gnu, x86_64-unknown-linux-musl]
+
+        include:
+          # Test nightly but don't fail the build.
+          - rust: nightly
+            experimental: true
+            TARGET: x86_64-unknown-linux-gnu
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.TARGET }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --target=${{ matrix.TARGET }}
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --target=${{ matrix.TARGET }}
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --target=${{ matrix.TARGET }}
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --target=${{ matrix.TARGET }} --examples

.github/workflows/clippy.yml

@@ -0,0 +1,20 @@
+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Clippy check
+jobs:
+  clippy_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: clippy
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/rustfmt.yml

@@ -0,0 +1,23 @@
+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Code formatting check
+
+jobs:
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check