add CI

.github/workflows/gh-pages.yml

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+name: github pages
+
+on:
+  push:
+    branches:
+      - main # Set a branch name to trigger deployment
+
+jobs:
+  deploy:
+    name: Deploy doc
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@main
+
+      - name: Use OCaml
+        uses: ocaml/setup-ocaml@v3
+        with:
+          ocaml-compiler: '5.2'
+          dune-cache: true
+          allow-prerelease-opam: true
+
+      # temporary until it's in a release
+      - run: opam pin picos 0.6.0 -y -n
+
+      - run: opam install picos moonpool trace
+
+      - run: opam exec -- odig odoc --cache-dir=_doc/ nanoev
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./_doc/html
+          destination_dir: .
+          enable_jekyll: false

.github/workflows/main.yml

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+name: Build and Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  run:
+    name: build  # build+test on various versions of OCaml, on linux
+    timeout-minutes: 15
+    strategy:
+      fail-fast: true
+      matrix:
+        os:
+            - ubuntu-latest
+        ocaml-compiler:
+            - '5.0'
+            - '5.3'
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@main
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: ocaml/setup-ocaml@v3
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+          dune-cache: true
+          allow-prerelease-opam: true
+
+      - run: opam exec -- dune build @install
+
+      # install some depopts
+      - run: opam pin picos 0.6.0 -y -n
+      - run: opam install -t moonpool trace picos
+
+      - run: opam exec -- dune build --profile=release --force @install @runtest
+
+  format:
+    name: format
+    strategy:
+      matrix:
+        ocaml-compiler:
+            - '5.2'
+    runs-on: 'ubuntu-latest'
+    steps:
+      - uses: actions/checkout@main
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: ocaml/setup-ocaml@v3
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+          dune-cache: true
+          allow-prerelease-opam: true
+
+      - run: opam install ocamlformat.0.26.2
+      - run: opam exec -- make format-check
+