ci: add devbuild and release-build (copy-pasted from fs...)

.github/workflows/devbuild.yml

@@ -0,0 +1,30 @@
+name: Development Builds
+
+on: [push, workflow_dispatch]
+
+jobs:
+  Build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 16
+      uses: actions/setup-java@v2
+      with:
+        distribution: 'adopt'
+        java-version: 16
+    - name: Cache Gradle packages
+      uses: actions/cache@v2
+      with:
+        path: ~/.gradle/caches
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+        restore-keys: ${{ runner.os }}-gradle
+    - name: Grant execute permission to gradlew
+      run: chmod +x gradlew
+    - name: Build with Gradle
+      run: ./gradlew build
+    - uses: actions/upload-artifact@v2
+      with:
+        name: Compiled artifacts for ${{ github.sha }}
+        path: build/libs

.github/workflows/release-build.yml

@@ -0,0 +1,47 @@
+# Thanks to https://github.com/gnembon/fabric-carpet/blob/master/.github/workflows/publish-release.yml
+# which is much more complicated..
+
+name: Release Builds
+
+on:
+  push:
+    tags:
+    - 'v*'
+
+jobs:
+  Build-And-Publish:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 16
+      uses: actions/setup-java@v2
+      with:
+        distribution: 'adopt'
+        java-version: 16
+    - name: Cache Gradle packages
+      uses: actions/cache@v2
+      with:
+        path: ~/.gradle/caches
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+        restore-keys: ${{ runner.os }}-gradle
+    - name: Grant execute permission to gradlew
+      run: chmod +x gradlew
+    - name: Build with Gradle
+      run: ./gradlew build
+    - uses: actions/upload-artifact@v2
+      with:
+        name: Compiled artifacts for ${{ github.sha }}
+        path: build/libs
+    - name: Find correct JAR
+      id: findjar
+      run: |
+        output="$(find build/libs/ ! -name "*-dev.jar" ! -name "*-sources.jar" -type f -printf "%f\n")"
+        echo "::set-output name=jarname::$output"
+    - name: Create Github release
+      uses: softprops/action-gh-release@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        files: build/libs/${{ steps.findjar.outputs.jarname }}