fix: update to push snapshot to maven local for iceberg build (#350)

We currently don't use the snapshot build when building the iceberg
artifacts this fixes that. Also adding a manual trigger so we can test
downstream changes and trigger this independent of a PR.

#### Does this contribution need a changelog entry?
- [x] I have updated the CHANGELOG or README if appropriate

---

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---------

Signed-off-by: stubz151 <[email protected]>

Author: stubz151

.github/workflows/build-upload.yml

@@ -2,6 +2,7 @@ name: Build and upload artifact JARs to S3 treatment bucket
 
 # Controls when the action will run. Invokes the workflow on push events but only for the main branch
 on:
+  workflow_dispatch:
   push:
     branches:
       - main
@@ -36,7 +37,7 @@ jobs:
 
       - name: Build with Gradle
         run: |
-          ./gradlew -PsnapshotBuild=true build
+          ./gradlew -PsnapshotBuild=true build publishToMavenLocal
           ./gradlew jmhJar
 
       - uses: actions/upload-artifact@v4
@@ -171,4 +172,4 @@ jobs:
         run: aws s3 cp iceberg-spark-runtime-3.5_2.12-1.6.0-SNAPSHOT.jar s3://${{ env.S3_BUCKET }}/s3fileio/iceberg-spark-runtime-3.5_2.12-1.6.0-SNAPSHOT.jar
 
 #      - name: Upload Hadoop JAR to S3A treatment bucket
-#        run: aws s3 cp hadoop-aws-3.5.0-SNAPSHOT.jar s3://${{ env.S3_BUCKET }}/s3a/hadoop-aws-3.5.0-SNAPSHOT.jar
+#        run: aws s3 cp hadoop-aws-3.5.0-SNAPSHOT.jar s3://${{ env.S3_BUCKET }}/s3a/hadoop-aws-3.5.0-SNAPSHOT.jar