Fix Variable format

Author: SaicharanKandukuri

.github/scripts/compute-release-tag.py

@@ -25,9 +25,9 @@
 
 BUILD_TYPE="AB"
 
-Latest_release_tag = "V-%s-%s%s%s" % (udroid_version,BUILD_TYPE,RELEASE_TYPE,IterationNumber)
+Latest_release_tag = "VERSIONTAG=V-%s-%s%s%s" % (udroid_version,BUILD_TYPE,RELEASE_TYPE,IterationNumber)
 
 with open(GITHUB_ENV_PATH, "a+") as f:
   f.write(Latest_release_tag)
 
-print(Latest_release_tag)
+print(Latest_release_tag)