[Build] Add workflows for automatic releases

.github/workflows/publish_to_maven.yml

@@ -0,0 +1,53 @@
+name: Publish to Maven
+on: workflow_dispatch
+jobs:
+  publish-modules:
+    strategy:
+      matrix:
+        module: [imgui-app, imgui-lwjgl3, imgui-binding]
+    name: Publish Module (${{ matrix.module }})
+    runs-on: ubuntu-latest
+    env:
+      NEXUS_UPD_ID: ${{ secrets.RELEASE_NEXUS_UPD_ID }}
+      NEXUS_UPD_PASS: ${{ secrets.RELEASE_NEXUS_UPD_PASS }}
+      SIGNING_KEY_ID: ${{ secrets.RELEASE_SIGNING_KEY_ID }}
+      SIGNING_KEY: ${{ secrets.RELEASE_SIGNING_KEY }}
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+
+      - name: Set up Java 8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 8
+
+      - name: Publish
+        uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: ${{ format(':{0}:publishMavenJavaPublicationToMavenCentralRepository', matrix.module) }}
+
+  publish-natives:
+    strategy:
+      matrix:
+        type: [win, linux, mac]
+        freetype: [true, false]
+    name: Publish Native (type=${{ matrix.type }}, freetype=${{ matrix.freetype }})
+    runs-on: ubuntu-latest
+    env:
+      NEXUS_UPD_ID: ${{ secrets.RELEASE_NEXUS_UPD_ID }}
+      NEXUS_UPD_PASS: ${{ secrets.RELEASE_NEXUS_UPD_PASS }}
+      SIGNING_KEY_ID: ${{ secrets.RELEASE_SIGNING_KEY_ID }}
+      SIGNING_KEY: ${{ secrets.RELEASE_SIGNING_KEY }}
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+
+      - name: Set up Java 8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 8
+
+      - name: Publish
+        uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: ${{ format(':imgui-binding-natives:publishMavenJavaPublicationToMavenCentralRepository -PdeployType={0} -Pfreetype={1}', matrix.type, matrix.freetype) }}