Remove AppVeyor and Travis, switch to GitHub Actions

Author: MisterDA

.appveyor.yml

@@ -0,0 +1,38 @@
+name: Main workflow
+
+on:
+  pull_request:
+  push:
+  schedule:
+    # Prime the caches every Monday
+    - cron: 0 1 * * MON
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+          - windows-latest
+        ocaml-compiler:
+          - 4.14
+          - 5
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: ocaml/setup-ocaml@v3
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+
+      - run: opam install . --deps-only --with-test
+
+      - run: opam exec -- dune build
+
+      - run: opam exec -- dune runtest

.github/workflows/main.yml

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/cedlemo/OCaml-GObject-Introspection.svg?branch=master)](https://travis-ci.org/cedlemo/OCaml-GObject-Introspection)
+[![Build Status](https://github.com/cedlemo/OCaml-GObject-Introspection/actions/workflows/main.yml/badge.svg?branch=master)](https://github.com/cedlemo/OCaml-GObject-Introspection/actions)
 [![License: GPL-3.0-or-later](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)