Add GitHub Actions workflow for building the application; update Makefile package path

Author: mathertel

.github/workflows/build.yml

@@ -0,0 +1,42 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Build on Ubuntu
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.26.4'
+
+      - name: Cache Go modules
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/go-build
+            ${{ github.workspace }}/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Build application
+        run: make build
+
+      - name: Validate binary exists
+        run: test -f bin/server

Makefile

@@ -1,7 +1,7 @@
 # Makefile for goding - build, test, run the server
 
 BINARY := bin/server
-PKG := ./cmd/server
+PKG := main.go
 
 .PHONY: all build test run clean help