Add CI tests, clippy and fmt checks (#12)

Using logos-co/Overwatch CI scripts for tests and linting in PRs.
The idea is to use this for now, and later gather all common action definitions into one dedicated repository.

* Copied CI test, clippy and fmt steps from Overwatch
* Added go 1.19 to an action setup (required for building waku-rust-bindigs dep)

.github/workflows/main.yml

@@ -0,0 +1,77 @@
+# copy of https://github.com/actions-rs/meta/blob/master/recipes/quickstart.md
+on: [push, pull_request]
+
+name: CI
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        continue-on-error: false
+        with:
+          command: check
+
+  test:
+    name: Test Suite
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - uses: actions/setup-go@v3 # we need go to build go-waku
+        with:
+          go-version: '1.19'
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        continue-on-error: false
+        with:
+          command: build
+      - uses: actions-rs/cargo@v1
+        continue-on-error: false
+        with:
+          command: test
+
+  lints:
+    name: Rust lints
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+
+      - name: Run cargo fmt
+        uses: actions-rs/cargo@v1
+        continue-on-error: false
+        with:
+          command: fmt
+          args: --all -- --check
+
+      - name: Run cargo clippy
+        uses: actions-rs/cargo@v1
+        continue-on-error: false
+        with:
+          command: clippy
+          args: -- --deny warnings