Add shared runner dependency setup for Linux and Windows

.gitea/workflows/integrations.yml

@@ -24,12 +24,8 @@ jobs:
         with:
           distribution: temurin
           java-version: '21'
-      - name: Verify integration runner
-        run: |
-          set -eu
-          test "$(uname -s)" = Linux
-          command -v java
-          java -version 2>&1 | grep -q '21\.' || { echo 'Paper needs Java 21'; exit 1; }
+      - name: Check Linux and Java dependencies
+        run: bash scripts/ci/install-linux.sh java 21
       - name: Build Paper with Gradle 8.10.2
         run: |
           sed -i 's/gradle-9.6.0-bin.zip/gradle-8.10.2-bin.zip/' integrations/gradle/wrapper/gradle-wrapper.properties
@@ -63,12 +59,8 @@ jobs:
         with:
           distribution: temurin
           java-version: ${{ matrix.mc.java }}
-      - name: Verify integration runner
-        run: |
-          set -eu
-          test "$(uname -s)" = Linux
-          command -v java
-          java -version 2>&1 | grep -q '${{ matrix.mc.java }}\.' || { echo 'Wrong Java version for this matrix entry'; exit 1; }
+      - name: Check Linux and Java dependencies
+        run: bash scripts/ci/install-linux.sh java '${{ matrix.mc.java }}'
       - name: Build both loaders
         run: |
           sed -i 's/gradle-9.6.0-bin.zip/gradle-${{ matrix.mc.gradle }}-bin.zip/' integrations/gradle/wrapper/gradle-wrapper.properties