ci: add github actions

fix #1

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly 

.github/workflows/build-test.yml

@@ -0,0 +1,40 @@
+name: Build and Test
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build-and-test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+          # - windows-latest
+        ocaml-version:
+          - 4.14
+          - 5.1
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use OCaml ${{ matrix.ocaml-version }}
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-version }}
+          dune-cache: true
+          opam-depext-flags: "--with-test"
+          allow-prerelease-opam: true
+
+      - run: opam install . --deps-only --with-test
+
+      - name: build project
+        run: opam exec -- dune build
+
+      - name: run test
+        run: opam exec -- dune runtest

.github/workflows/lint.yml

@@ -0,0 +1,57 @@
+name: Lint
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  lint-fmt:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use OCaml 5.1
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: 5.1
+          dune-cache: true
+          opam-depext-flags: "--with-doc"
+          allow-prerelease-opam: true
+
+      - name: Lint fmt
+        uses: ocaml/setup-ocaml/lint-fmt@v2
+
+  lint-opam:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use OCaml 5.1
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: 5.1
+          dune-cache: true
+          opam-depext-flags: "--with-doc"
+          allow-prerelease-opam: true
+
+      - name: Lint opam
+        uses: ocaml/setup-ocaml/lint-opam@v2
+
+  lint-doc:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use OCaml 5.1
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: 5.1
+          dune-cache: true
+          opam-depext-flags: "--with-doc"
+          allow-prerelease-opam: true
+
+      - name: Lint doc
+        uses: ocaml/setup-ocaml/lint-doc@v2

.github/workflows/opam-dependency-submission.yml

@@ -0,0 +1,22 @@
+name: Opam Dependency Submission
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  opam-dependency-submission:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout tree
+        uses: actions/checkout@v4
+
+      - name: Set-up OCaml 5.1
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: 5.1
+          dune-cache: true
+          allow-prerelease-opam: true
+
+      - name: Opam Dependency Submission
+        uses: ocaml/setup-ocaml/analysis@v2