Add github actions CI and remove travis CI

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+---
+name: Build and test
+on:
+  - push
+  # Build if requested manually from the Actions tab
+  - workflow_dispatch
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: --deny warnings
+
+jobs:
+  formatting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          components: rustfmt
+          default: true
+      - name: Check formatting
+        run: cargo fmt -- --check
+
+# Enable this after fixing all the stuff clippy complains about
+#  linting:
+#    runs-on: ubuntu-latest
+#    steps:
+#      - uses: actions/checkout@v4
+#      - uses: actions-rs/toolchain@v1
+#        with:
+#          profile: minimal
+#          toolchain: stable
+#          components: clippy
+#          default: true
+#      - name: Lint (clippy)
+#        uses: actions-rs/clippy-check@v1
+#        with:
+#          token: ${{ secrets.GITHUB_TOKEN }}
+
+  build-and-test:
+    strategy:
+      matrix:
+        rust: [stable, beta, nightly, 1.60.0]
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          default: true
+
+      - name: Build
+        run: cargo build --all-targets
+
+      - name: Test
+        run: cargo test