chore: update config to read PR number

Signed-off-by: Arjun Rajappa <Arjun.Rajappa@ibm.com>

Author: arjun-rajappa

.circleci/config.yml

@@ -136,19 +136,23 @@ commands:
           environment:
             SONAR_TOKEN: $SONAR_TOKEN
           command: |
-            export SONAR_SCANNER_VERSION=7.2.0.5079
+            #!/usr/bin/env bash
+            
+            PR_NUMBER=$(echo ${CIRCLE_PULL_REQUEST} | sed 's/.*\///')
+            SONAR_SCANNER_VERSION=${SONAR_SCANNER_VERSION}
             export SONAR_SCANNER_HOME=$HOME/.sonar/sonar-scanner-$SONAR_SCANNER_VERSION-linux-x64
+            SONAR_TOKEN=${SONAR_TOKEN}
             curl --create-dirs -sSLo $HOME/.sonar/sonar-scanner.zip https://binaries.sonarsource.com/Distribution/sonar-scanner-cli/sonar-scanner-cli-$SONAR_SCANNER_VERSION-linux-x64.zip
             unzip -o $HOME/.sonar/sonar-scanner.zip -d $HOME/.sonar/
             export PATH=$SONAR_SCANNER_HOME/bin:$PATH
             export SONAR_SCANNER_OPTS="-server"
-            if [[ -n "${CIRCLE_PR_NUMBER}" ]]; then
+            if [[ -n "${PR_NUMBER}" ]]; then
               sonar-scanner \
                 -Dsonar.organization=instana \
                 -Dsonar.projectKey=instana_ruby-sensor \
                 -Dsonar.sources=. \
                 -Dsonar.host.url="${SONARQUBE_URL}" \
-                -Dsonar.pullrequest.key="${CIRCLE_PR_NUMBER}" \
+                -Dsonar.pullrequest.key="${PR_NUMBER}" \
                 -Dsonar.pullrequest.branch="${CIRCLE_BRANCH}"
             else
               sonar-scanner \