ci: add workflow for master and test release drafter

Author: tommytroen

.github/release-drafter.yml

@@ -0,0 +1,16 @@
+name-template: $NEXT_PATCH_VERSION
+tag-template: $NEXT_PATCH_VERSION
+change-template: '- $TITLE (#$NUMBER) @$AUTHOR'
+categories:
+  - title: Major Changes
+    label: "changes: major"
+
+  - title: Minor Changes
+    label: "changes: minor"
+
+  - title: Patch Changes
+    label: "changes: patch"
+
+template: |
+  ## Non-version Changes
+  $CHANGES

.github/workflows/build-master.yml

@@ -0,0 +1,36 @@
+name: Build master
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout latest code
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+
+      - name: Setup build cache
+        uses: actions/cache@v1
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: Build with Gradle
+        run: ./gradlew build
+
+  release-notes:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Release Drafter
+        uses: release-drafter/release-drafter@v5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}