Push Github actions file

.github/workflows/build.yml

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+name: build
+run-name: Build Bamm
+on: [push]
+jobs:
+  build_matrix:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ocaml_compiler: [
+            # OCaml LTS version
+            ocaml.4.14.1,
+            # ocaml-system for Fedora 39
+            ocaml.5.0.0,
+            # ocaml-system for Archlinux
+            ocaml.5.1.0
+          ]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install system dependencies
+        run: sudo apt install opam
+      - name: Initialize Opam
+        run: opam init -n --bare
+      - name: Install dependencies
+        run: opam install . --deps-only -t
+      - name: Build Spatial Shell
+        run: |
+          eval $(opam env)
+          dune build .