Docker: Allow to issue pull on tag entry (i.e. to fetch updates for the tag)

[matthiasblaesing]

NetBeans lists the available images/tags for a system. There were various actions available for the images/tags, but there was no option to fetch updates for the tag. This PR adds a "Pull" option to the image menu:

[mbien]

tested with userpace podman (which should be API compatible with Docker) connected via unix socket and it worked.

note: I don't have a local image registry set up, so using the action on a locally created image will fail with "Internal Server Error" in output + info log line in NB's log file:

INFO [org.netbeans.modules.docker.ui.pull.PullImageAction]
org.netbeans.modules.docker.DockerRemoteException: 500: Internal Server Error
	at org.netbeans.modules.docker.api.DockerAction.codeToException(DockerAction.java:1338)
	at org.netbeans.modules.docker.api.DockerAction.pull(DockerAction.java:571)
[catch] at org.netbeans.modules.docker.ui.pull.PullImageAction$Pull.run(PullImageAction.java:187)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1370)
	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:287)
	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1981)
INFO [org.netbeans.modules.docker.api.DockerAction]: Unknown event {"Type":"image","Action":"pull-error","Actor":{"Attributes":{"image":"","name":"localhost\/custom:latest","error":"unable to copy from source docker:\/\/localhost\/custom:latest: initializing source docker:\/\/localhost\/custom:latest: fetching manifest latest in localhost\/custom: pinging container registry localhost: Get \"https:\/\/localhost\/v2\/\": dial tcp [::1]:443: connect: connection refused","podId":""},"ID":""},"scope":"local","timeNano":1789577079075095615,"time":1789577079,"status":"pull-error"}

This can probably be improved by updating the exception handler. Maybe it could print something more useful instead of "Internal Server Error", given that the exception has a pretty good error message as json.