Syntax fixes for getting digest

Author: CodeByDrescher

.github/workflows/ci.yml

@@ -260,10 +260,9 @@ jobs:
               run: |
                   containerLabel=${{ steps.get-docker-image-tag.outputs.dockerImageBaseUrl }}:${{ steps.get-docker-image-tag.outputs.simulatorVersion }}
                   docker pull $containerLabel
-                  imageId=docker image ls | grep ${{ steps.get-docker-image-tag.outputs.dockerImageBaseUrl }} \
-                    grep ${{ steps.get-docker-image-tag.outputs.simulatorVersion }} | awk '{ print $3; ]'
+                  imageId=$(docker image ls | grep ${{ steps.get-docker-image-tag.outputs.dockerImageBaseUrl }} grep ${{ steps.get-docker-image-tag.outputs.simulatorVersion }} | awk '{ print $3; }')
                   
-                  dockerDigest=docker inspect --format='{{index .RepoDigests 0}}' $imageId | cut -d '@' -f 2
+                  dockerDigest=$(docker inspect --format='{{index .RepoDigests 0}}' $imageId | cut -d '@' -f 2)
                   
                   sed -i -E "s/__CONTAINER_DIGEST__/${dockerDigest}/g" biosimulators.json