ci: Propose a workflow that doesn't fail on modern Java and Gradle

.github/workflows/build.yml

@@ -0,0 +1,40 @@
+name: "build"
+
+on: ["pull_request", "push"]
+
+jobs:
+  build:
+    # Only run on PRs if the source branch is on someone else's repo
+    if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: "checkout repository"
+        uses: "actions/checkout@v2.3.4"
+      - name: "validate gradle wrapper"
+        uses: "gradle/wrapper-validation-action@v1.0.4"
+      - name: "setup JDK 16"
+        uses: "actions/setup-java@v2.2.0"
+        with:
+          distribution: 'temurin'
+          java-version: "16"
+      - name: "build"
+        run: "./gradlew clean build -x test"
+      - name: "determine status"
+        run: |
+          if [ "$(./gradlew properties | awk '/^version:/ { print $2; }' | grep '\-SNAPSHOT')" ]; then
+            echo "STATUS=snapshot" >> $GITHUB_ENV
+          else
+            echo "STATUS=release" >> $GITHUB_ENV
+          fi
+      - name: "publish snapshot"
+        if: "${{ env.STATUS != 'release' && github.event_name == 'push' && github.ref == 'refs/heads/master' }}"
+        run: ./gradlew publishToSonatype
+        env:
+          ORG_GRADLE_PROJECT_sonatypeUsername: "${{ secrets.SONATYPE_USERNAME }}"
+          ORG_GRADLE_PROJECT_sonatypePassword: "${{ secrets.SONATYPE_PASSWORD }}"
+      - name: "publish release"
+        if: "${{ env.STATUS == 'release' && github.event_name == 'release' }}"
+        run: ./gradlew publishPlugins
+        env:
+          ORG_GRADLE_PROJECT_pluginPortalApiKey: "${{ secrets.GRADLE_PLUGIN_API_KEY }}"
+          ORG_GRADLE_PROJECT_pluginPortalApiSecret: "${{ secrets.GRADLE_PLUGIN_API_SECRET }}"

README.adoc

@@ -17,7 +17,7 @@ https://github.com/ec4j/editorconfig-gradle-plugin/issues[report] them!
 
 == Basic usage
 
-`editorconfig-gradle-plugin` requires Java 7+ and Gradle 4.1+.
+`editorconfig-gradle-plugin` requires Java 8+ and Gradle 4.1+.
 
 To apply the plugin, add the following to your project:
 
@@ -115,7 +115,7 @@ duplicate work.
 
 Prerequisites:
 
-* Java 7+
+* Java 8+
 
 The most common build with unit tests:
 
@@ -140,7 +140,7 @@ On Windows:
 git status
 
 relVersion=...
-sed -i "s/version = '[^']'/version = '${relVersion}'/" build.gradle
+sed -i "s/version = '[^']'/version = '${relVersion}'/" build.gradle.kts
 git add -A
 git commit -m "Release ${relVersion}"
 git tag ${relVersion}