Update cheatsheets

tldr/sfdk-engine

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sfdk engine
+
+> Maintains and controls the build engine.
+> More information: <https://docs.sailfishos.org/Develop/Apps/#sailfish-os-build-engine>.
+
+- Start the build engine:
+
+`sfdk engine start`
+
+- Stop the build engine:
+
+`sfdk engine stop`
+
+- Show the build engine status:
+
+`sfdk engine status`
+
+- Set an engine property:
+
+`sfdk engine set {{property}}={{value}}`
+
+- Show the engine properties:
+
+`sfdk engine show`
+
+- Execute a command on the build engine:
+
+`sfdk engine exec {{command}}`
+
+- Start an interactive shell on the build engine:
+
+`sfdk engine exec`