update GHA workflows (GregTechCEu#2270)

.github/actions/build_setup/action.yml

@@ -0,0 +1,30 @@
+name: Build Setup
+description: Setup for standard Java builds
+
+inputs:
+  update-cache:
+    description: If cache should be updated
+    required: false
+    default: false
+
+runs:
+  using: 'composite'
+
+  steps:
+  - name: Set up JDK 17
+    uses: actions/setup-java@v4
+    with:
+      distribution: zulu
+      java-version: 17
+
+  - name: Setup Gradle
+    uses: gradle/gradle-build-action@v2
+    with:
+      cache-write-only: ${{ inputs.update-cache }}
+      generate-job-summary: false
+      gradle-home-cache-includes: |
+        caches
+        caches/retro_futura_gradle
+        notifications
+        jdks
+        wrapper

.github/workflows/format_java.yml

@@ -0,0 +1,29 @@
+# Runs formatting requirements
+name: Java Formatting
+
+on:
+  push:
+    branches:
+      - master
+    paths: ['src/main/java/**', 'src/test/**']
+  pull_request:
+    paths: ['src/main/java/**', 'src/test/**']
+
+concurrency:
+  group: checks-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  formatting:
+    name: Formatting
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Setup Build
+        uses: ./.github/actions/build_setup
+
+      - name: Run Spotless Formatting Check with Gradle
+        run: ./gradlew spotlessCheck --warning-mode all --build-cache

.github/workflows/manage_pr_labels.yml

@@ -0,0 +1,39 @@
+# Manages labels on PRs before allowing merging
+name: Pull Request Labels
+
+on:
+  pull_request:
+    types:
+      - opened
+      - labeled
+      - unlabeled
+      - synchronize
+
+# if a second commit is pushed quickly after the first, cancel the first one's build
+concurrency:
+  group: pr-labels-${{ github.head_ref }}
+  cancel-in-progress: true
+
+jobs:
+  Labels:
+    runs-on: ubuntu-latest
+
+    permissions:
+      pull-requests: read # needed to utilize required-labels
+
+    steps:
+      - name: Check for Merge-Blocking Labels # blocks merge if present
+        uses: mheap/github-action-required-labels@v5
+        with:
+          mode: exactly
+          count: 0
+          labels: 'status: do not merge'
+          exit_type: failure
+
+      - name: Check for Required Labels # require at least one of these labels
+        uses: mheap/github-action-required-labels@v5
+        with:
+          mode: minimum
+          count: 1
+          labels: 'type: feature, type: bug, type: refactor, type: translation, ignore changelog'
+          exit_type: failure