ci: improve setup

Earlier CI workflow was doing the build as many times as the number of
tests set. If the build fails, it is kind of not optimal use os
resources.
This change allows building once and then sharing the built artifacts to
all test runners.

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

Author: shwstppr

.github/workflows/ci.yml

@@ -30,6 +30,68 @@ jobs:
   build:
     if: github.repository == 'apache/cloudstack'
     runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+          cache: 'maven'
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.10'
+          architecture: 'x64'
+
+      - name: Install Build Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y git uuid-runtime genisoimage netcat-openbsd ipmitool build-essential libgcrypt20 libgpg-error-dev libgpg-error0 libopenipmi0 ipmitool libpython3-dev libssl-dev libffi-dev python3-openssl python3-dev python3-setuptools
+
+      - name: Env details
+        run: |
+          uname -a
+          whoami
+          javac -version
+          mvn -v
+          python3 --version
+          free -m
+          nproc
+
+      - name: Build with Maven
+        run: |
+          mvn -B -P developer,systemvm -Dsimulator clean install -DskipTests=true -T$(nproc)
+
+      - name: Package build output
+        run: |
+          paths=($(find . -type d -name target))
+          for p in engine/schema/dist systemvm/dist; do
+            [ -d "$p" ] && paths+=("$p")
+          done
+          tar --zstd -cf target-output.tar.zst "${paths[@]}"
+          tar --zstd -cf m2-cloudstack.tar.zst -C "$HOME" .m2/repository/org/apache/cloudstack
+          tar --zstd -cf marvin-dist.tar.zst tools/marvin/dist
+
+      - name: Upload build output
+        uses: actions/upload-artifact@v4
+        with:
+          name: simulator-ci-build-output
+          path: |
+            target-output.tar.zst
+            m2-cloudstack.tar.zst
+            marvin-dist.tar.zst
+          retention-days: 1
+          compression-level: 0
+
+  test:
+    if: github.repository == 'apache/cloudstack'
+    needs: build
+    runs-on: ubuntu-24.04
 
     strategy:
       fail-fast: false
@@ -286,9 +348,16 @@ jobs:
           sudo systemctl restart mysql
           sudo mysql -uroot -e "SELECT VERSION();"
 
-      - name: Build with Maven
+      - name: Download build output
+        uses: actions/download-artifact@v4
+        with:
+          name: simulator-ci-build-output
+
+      - name: Extract build output
         run: |
-          mvn -B -P developer,systemvm -Dsimulator clean install -DskipTests=true -T$(nproc)
+          tar --zstd -xf target-output.tar.zst
+          tar --zstd -xf m2-cloudstack.tar.zst -C "$HOME"
+          tar --zstd -xf marvin-dist.tar.zst
 
       - name: Setup Simulator Prerequisites
         run: |