Replace Travis CI with GitHub Actions

Tests on Go 1.22 and 1.24 on push and PR to master.

Author: dave

.github/workflows/test.yml

@@ -0,0 +1,21 @@
+name: Test
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go: ["1.22", "1.24"]
+    name: Go ${{ matrix.go }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go }}
+      - run: go test ./...