CI: move to github container registry (#7652)

We move the CI images to the github container registry.

Given we mostly (if not solely) run these containers on github actions
infra it makes sense to have them hosted closer to where they are
needed.

Image changes: citusdata/the-process#157

.devcontainer/src/test/regress/Pipfile

@@ -5,7 +5,7 @@ verify_ssl = true
 
 [packages]
 mitmproxy = {editable = true, ref = "main", git = "https://github.com/citusdata/mitmproxy.git"}
-construct = "==2.9.45"
+construct = "*"
 docopt = "==0.6.2"
 cryptography = ">=41.0.4"
 pytest = "*"
@@ -16,6 +16,7 @@ pytest-timeout = "*"
 pytest-xdist = "*"
 pytest-repeat = "*"
 pyyaml = "*"
+werkzeug = "==2.3.7"
 
 [dev-packages]
 black = "*"