Add instructions for Squeak trunk image prep

hpi-swa · Apr 20, 2021 · d62927d · d62927d
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+# Preparation of Squeak Trunk images
+
+*For 64/32-bit trunk images with update level 20447 or higher.*
+
+```smalltalk
+"Ensure Metacello is loaded."
+Metacello new.
+"Ensure Tonel is loaded."
+[ (Smalltalk classNamed: #MCTonelMissing) signal ] valueSupplyingAnswer: true.
+"Clean up and save the image."
+ReleaseBuilder deleteAllWindows.
+Smalltalk garbageCollect.
+Smalltalk condenseChanges.
+Smalltalk snapshot: true andQuit: true.
+```