Restored SENZING_DIR env variable as pom.xml uses it

Author: barrycaceres

.github/workflows/java-linux-snippets.yaml

@@ -37,6 +37,8 @@ jobs:
           senzingsdk-repository-path: ${{ secrets.SENZING_APT_BETA_STAGING_REPOSITORY_URL }}
 
       - name: build with Maven
+        env:
+          SENZING_DIR: "/opt/senzing/er"
         run: |
           cd "${GITHUB_WORKSPACE}"/java
           mvn clean package