release/deploy-github: simplify tag checks

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

release/deploy-github.sh

@@ -4,16 +4,8 @@ trap 'exit 1' SIGINT SIGTERM
 
 [ -z "$(command -v hub)" ] && { echo "hub not installed; aborting!"; exit 1; }
 [ -z "${1}" ] && { echo "No tag specified!"; exit 1; }
-found_tag=
-git tag -l | while read -r tag; do
-  if [ "$tag" == "${1}" ]; then
-    found_tag=true
-    break
-  fi
-done
-[ -z "${found_tag}" ] && { echo "Cannot find tag ${1} in the repository"; exit 1; }
 prev_ref="$(git rev-parse --abbrev-ref HEAD)"
-git checkout "${1}"
+git checkout "${1}" || exit 1
 gradle clean bundleRelease assembleRelease
 hub release create "${1}" -a app/build/outputs/apk/release/app-release.apk
 git checkout "$prev_ref"