Upgrade to Go 1.27 and standardize CI badges

.github/workflows/go.yml

@@ -1,24 +1,35 @@
 name: Build & Test
 
 on:
-  workflow_dispatch:
+  push:
+    branches: [main]
   pull_request:
     branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
 
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: src
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
-      - uses: actions/setup-go@v5
+      - name: Set up Go
+        uses: actions/setup-go@v7
         with:
-          go-version-file: src/go.mod
+          go-version: "1.27.x"
+          cache-dependency-path: src/go.sum
 
       - name: Build
-        working-directory: src
         run: go build ./...
 
       - name: Test
-        working-directory: src
-        run: go test ./...
+        run: go test -race ./...
+
+      - name: Vet
+        run: go vet ./...

README.md

@@ -1,4 +1,5 @@
-[![Build & Test](https://github.com/markmnl/fmsgid/actions/workflows/go.yml/badge.svg)](https://github.com/markmnl/fmsgid/actions/workflows/go.yml)
+[![Build & Test](https://github.com/markmnl/fmsgid/actions/workflows/go.yml/badge.svg?branch=main)](https://github.com/markmnl/fmsgid/actions/workflows/go.yml?query=branch%3Amain)
+[![Go 1.27+](https://img.shields.io/badge/Go-1.27%2B-00ADD8?logo=go&logoColor=white)](https://go.dev/dl/)
 
 # fmsgid
 
@@ -26,6 +27,8 @@ FMSGID_CSV_FILE=/path/to/addresses.csv
 
 ## Build
 
+Requires Go 1.27 or newer.
+
 From the `src` directory:
 ```
 go build .

src/go.mod

@@ -1,6 +1,6 @@
 module github.com/markmnl/fmsgid
 
-go 1.25.0
+go 1.27.0
 
 require (
 	github.com/fsnotify/fsnotify v1.9.0