More dockerTag escape tinkering.

azure-pipelines.yml

@@ -173,14 +173,14 @@ stages:
           Dockerfile: '$(Build.SourcesDirectory)/Dockerfile'
           buildContext: '$(Build.SourcesDirectory)'
           tags: |
-            '$(dockerTag)'
+            ${{ variables.dockerTag }}
 
       - bash: |
           set -xeuo pipefail
           mkdir $(build.artifactStagingDirectory)/dockerImage
-          echo 'tag = $(dockerTag)'
+          echo 'tag = ${{ variables.dockerTag }}'
           docker save -o $(build.artifactStagingDirectory)/dockerImage/core-data.tar.gz \
-            aasworldwidetelescope/core-data:$(dockerTag)
+            aasworldwidetelescope/core-data:${{ variables.dockerTag }}
         displayName: Save image as artifact
 
       - publish: $(build.artifactStagingDirectory)/dockerImage
@@ -255,4 +255,4 @@ stages:
           repository: 'aasworldwidetelescope/core-data'
           command: 'push'
           tags: |
-            '$(dockerTag)'
+            ${{ variables.dockerTag }}