build: downgrade to Gradle 8 (#455)

* build: consistently use gradlew during build

Signed-off-by: Niels Pardon <par@zurich.ibm.com>

* build: downgrade to Gradle 8

revert "build: update to Gradle 9 (#454)"

Signed-off-by: Niels Pardon <par@zurich.ibm.com>

---------

Signed-off-by: Niels Pardon <par@zurich.ibm.com>

Author: nielspardon

.github/workflows/pr.yml

@@ -73,7 +73,7 @@ jobs:
           # fetch submodule tags since actions/checkout@v4 does not
           git submodule foreach 'git fetch --unshallow || true'
 
-          gradle build --rerun-tasks
+          ./gradlew build --rerun-tasks
   examples:
     name: Build Examples
     runs-on: ubuntu-latest
@@ -122,7 +122,7 @@ jobs:
         # fetch submodule tags since actions/checkout@v4 does not
         git submodule foreach 'git fetch --unshallow || true'
 
-        gradle nativeImage
+        ./gradlew nativeImage
     - name: Smoke Test
       run: |
         ./isthmus-cli/src/test/script/smoke.sh

.github/workflows/release.yml

@@ -39,7 +39,7 @@ jobs:
           # fetch submodule tags since actions/checkout@v4 does not
           git submodule foreach 'git fetch --unshallow || true'
 
-          gradle nativeImage
+          ./gradlew nativeImage
       - name: Smoke Test
         run: |
           ./isthmus-cli/src/test/script/smoke.sh

ci/release/publish.sh

@@ -6,7 +6,6 @@ set -euo pipefail
 # ensure the submodule tags exist
 git submodule foreach 'git fetch --unshallow || true'
 
-gradle wrapper
 ./gradlew clean
 ./gradlew publishAllPublicationsToStagingRepository
 ./gradlew jreleaserDeploy

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME