Set up GitHub Actions workflow to run test on push & PR

.github/workflows/tests.yaml

@@ -0,0 +1,25 @@
+name: tests
+run-name: ${{ github.actor }} is running tests
+on: [push, pull_request]
+env:
+  GO_MINIMUM_VERSION: 1.20
+jobs:
+  go_minimum:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5.0.0
+        with:
+          go-version: ${{ env.GO_MINIMUM_VERSION }}
+      - run: go test ./packedrtree ./flatgeobuf
+  go_latest:
+    runs-on: ubuntu-latest
+    steps:
+     - uses: actions/checkout@v4
+     - uses: actions/setup-go@v5.0.0
+       with:
+         go-version: ${{ env.GO_MINIMUM_VERSION }}
+         check-latest: true

README.md

@@ -6,6 +6,8 @@ performant binary encoding for geographic data based on
 
 ## Project Status
 
+![test status](https://github.com/gogama/flatgeobuf/actions/workflows/tests.yaml/badge.svg)
+
 The most recent release is [v0.9.3-alpha](https://github.com/gogama/flatgeobuf/releases/tag/v0.9.3-alpha).
 
 A beta release is expected by 2023-12-31. A stable v1.0.0 will be