chore: initialise Go project (#6)

* chore: add editorconfig

* chore: initialise go project

* chore: scaffold workflow

* chore: add lint, format and test jobs

* test: force bad formatting

* fix: check changed files

* fix: reformat

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+insert_final_newline = true
+charset = utf-8
+end_of_line = lf
+trim_trailing_whitespace = true
+max_line_length = 80
+
+[*.go]
+indent_style = space
+indent_size = 2

.github/workflows/ci.yml

@@ -0,0 +1,66 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  pull-requests: read
+  checks: write
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: ./go.mod
+
+      - name: Go Vet
+        run: go vet ./...
+
+      - name: Go Lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: latest
+
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: ./go.mod
+
+      - name: Go Fmt
+        run: go fmt ./...
+
+      - name: Check changed files
+        run: |
+          git diff --exit-code
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: ./go.mod
+
+      - name: Go Test
+        run: go test -v ./...

go.mod

@@ -0,0 +1,3 @@
+module github.com/rsturla/dmarc-monitor
+
+go 1.22.5

main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello, World!")
+}