CI: Create workflow

Author: NotGhoull

.github/workflows/build.yml

@@ -0,0 +1,71 @@
+name: CI/CD
+
+on:
+  push:
+    branches:
+      - main
+      - multiloader
+  pull_request:
+    branches:
+      - main
+      - multiloader
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: 'gradle'
+
+      - name: Get commit SHA
+        id: commit_sha
+        run: echo "sha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+      - name: Read current version from gradle.properties
+        id: get_version
+        run: |
+          version=$(grep -A 1 "# GH_WORKFLOW::VERSION" gradle.properties | grep -oP '(?<=version=).*')
+          echo "current_version=$version" >> $GITHUB_OUTPUT
+
+      - name: Set dynamic version
+        id: set_version
+        run: |
+          DYNAMIC_VERSION="${{ steps.get_version.outputs.current_version }}-${{ steps.commit_sha.outputs.sha }}"
+          echo "Dynamic version: $DYNAMIC_VERSION"
+          echo "new_version=$DYNAMIC_VERSION" >> $GITHUB_OUTPUT
+
+      - name: Update gradle.properties
+        run: |
+          sed -i "s/^version=.*/version=${{ steps.set_version.outputs.new_version }}/" gradle.properties
+          cat gradle.properties
+
+      - name: Build
+        run: ./gradlew build
+
+      - name: Upload artifacts (Fabric)
+        uses: actions/upload-artifact@v4
+        with:
+          name: "mismatched-chests-fabric"
+          path: "./fabric/build/libs/mismatched_chests-fabric-1.21-${{ steps.set_version.outputs.new_version }}*.jar"
+
+      - name: Upload artifacts (Neoforge)
+        uses: actions/upload-artifact@v4
+        with:
+          name: "mismatched-chests-neoforge"
+          path: "./neoforge/build/libs/mismatched_chests-neoforge-1.21-${{ steps.set_version.outputs.new_version }}*.jar"
+
+      - name: Upload artifacts (Forge)
+        uses: actions/upload-artifact@v4
+        with:
+          name: "mismatched-chests-forge"
+          path: "./forge/build/libs/Mismatched Chests-forge-1.21-${{ steps.set_version.outputs.new_version }}*.jar"