smalltalkci: add page (#7580)

pages/common/smalltalkci.md

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+# smalltalkci
+
+> Framework for testing Smalltalk projects with GitHub Actions, Travis CI, AppVeyor, GitLab CI, and others.
+> More information: <https://github.com/hpi-swa/smalltalkCI>.
+
+- Run tests for a configuration file:
+
+`smalltalkci {{path/to/.smalltalk.ston}}`
+
+- Run tests for the `.smalltalk.ston` configuration in the current directory:
+
+`smalltalkci`
+
+- Debug tests in headful mode (show VM window):
+
+`smalltalkci --headful`
+
+- Download and prepare a well-known smalltalk image for the tests:
+
+`smalltalkci --smalltalk {{Squeak64-Trunk}}`
+
+- Specify a custom Smalltalk image and VM:
+
+`smalltalkci --image {{path/to/Smalltalk.image}} -- vm {{path/to/vm}}`
+
+- Clean up caches and delete builds:
+
+`smalltalkci --clean`