Add CI workflows and update Gradle build script

Introduce GitHub Actions workflows for testing on merge and publishing on alpha tags. Update `build.gradle.kts` to support dynamic plugin channels. Changes also include adjustments to project configuration in `.idea/workspace.xml`.

.github/workflows/deploy-alpha.yml

@@ -0,0 +1,64 @@
+name: Test and Publish
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'alpha-*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'adopt'
+
+      - name: Cache Gradle packages
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Run tests
+        run: ./gradlew test
+
+  publish:
+    if: startsWith(github.ref, 'refs/tags/alpha')
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'adopt'
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Publish Plugin
+        run: ./gradlew publishPlugin
+        env:
+          PLUGIN_REPO: ${{ secrets.PLUGIN_REPO }}
+          PLUGIN_TOKEN: ${{ secrets.PLUGIN_TOKEN }}

.github/workflows/test.yaml

@@ -0,0 +1,39 @@
+name: Test on Merge
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'adopt'
+
+      - name: Cache Gradle packages
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Run tests
+        run: ./gradlew test