Use java 8 & Gitea workflow

.gitea/workflows/build.yml

@@ -0,0 +1,34 @@
+name: Build Bukkit
+
+on:
+  push:
+    branches:
+      - master
+      - dev
+      - 1.2.5-R2.0
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: 8
+          distribution: 'temurin'
+
+      - name: Build all
+        run: mvn clean package
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: bukkit
+          path: |
+            ${{ gitea.workspace }}/target/*.jar
+            ${{ gitea.workspace }}/target/dependency-reduced-pom.xml

pom.xml

@@ -45,8 +45,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>2.0.2</version>
                 <configuration>
-                    <source>1.5</source>
+                    <source>1.8</source>
-                    <target>1.5</target>
+                    <target>1.8</target>
                 </configuration>
             </plugin>
             <plugin>