feat: cicd workflow to build the project (#1)

Adding a GitHub Actions workflow to build the project when any
project-related files are changed in a pull request or in a push to the
main branch.

.github/workflows/build.yml

@@ -0,0 +1,40 @@
+name: Xcode Build
+
+on:
+  push:
+    branches: ["main"]
+    paths:
+      - "DropMeJPEG/**"
+      - "DropMeJPEG.xcodeproj/**"
+      - ".github/workflows/build.yml" # This file
+  pull_request:
+    paths:
+      - "DropMeJPEG/**"
+      - "DropMeJPEG.xcodeproj/**"
+      - ".github/workflows/build.yml" # This file
+
+jobs:
+  build:
+    name: Build and analyze default scheme using xcodebuild command
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set Default Scheme
+        run: |
+          scheme_list=$(xcodebuild -list -json | tr -d "\n")
+          default=$(echo $scheme_list | ruby -e "require 'json'; puts JSON.parse(STDIN.gets)['project']['targets'][0]")
+          echo $default | cat >default
+          echo Using default scheme: $default
+
+      - name: Build
+        env:
+          scheme: ${{ 'default' }}
+        run: |
+          if [ $scheme = default ]; then scheme=$(cat default); fi
+          if [ "`ls -A | grep -i \\.xcworkspace\$`" ]; then filetype_parameter="workspace" && file_to_build="`ls -A | grep -i \\.xcworkspace\$`"; else filetype_parameter="project" && file_to_build="`ls -A | grep -i \\.xcodeproj\$`"; fi
+          file_to_build=`echo $file_to_build | awk '{$1=$1;print}'`
+          mkdir -p build
+          BUILD_DIR=build
+          xcodebuild clean build analyze -scheme "$scheme" -"$filetype_parameter" "$file_to_build" | xcpretty && exit ${PIPESTATUS[0]}