skip non-py tags

Signed-off-by: aiordache <anca.iordache@docker.com>

Jenkinsfile

@@ -14,7 +14,7 @@ def buildImage = { name, buildargs, pyTag ->
     img = docker.build(name, buildargs)
     img.push()
   }
-  images[pyTag] = img.id
+  if (pyTag?.trim()) images[pyTag] = img.id
 }
 
 def buildImages = { ->
@@ -26,7 +26,7 @@ def buildImages = { ->
       imageNamePy3 = "${imageNameBase}:py3-${gitCommit()}"
       imageDindSSH = "${imageNameBase}:sshdind-${gitCommit()}"
 
-      buildImage(imageDindSSH, "-f tests/Dockerfile-ssh-dind .", "ssh-dind")
+      buildImage(imageDindSSH, "-f tests/Dockerfile-ssh-dind .", "")
       buildImage(imageNamePy2, "-f tests/Dockerfile --build-arg PYTHON_VERSION=2.7 .", "py2.7")
       buildImage(imageNamePy3, "-f tests/Dockerfile --build-arg PYTHON_VERSION=3.7 .", "py3.7")
 
@@ -80,6 +80,7 @@ def runTests = { Map settings ->
     wrappedNode(label: "amd64 && ubuntu-1804 && overlay2", cleanWorkspace: true) {
       stage("test python=${pythonVersion} / docker=${dockerVersion}") {
         checkout(scm)
+
         def dindContainerName = "dpy-dind-\$BUILD_NUMBER-\$EXECUTOR_NUMBER-${pythonVersion}-${dockerVersion}"
         def testContainerName = "dpy-tests-\$BUILD_NUMBER-\$EXECUTOR_NUMBER-${pythonVersion}-${dockerVersion}"
         def testNetwork = "dpy-testnet-\$BUILD_NUMBER-\$EXECUTOR_NUMBER-${pythonVersion}-${dockerVersion}"