Resolve "[Docker] Install some system utilities in base image"

Closes #595 (closed)

CHANGELOG.rst

@@ -25,6 +25,8 @@ Changed
   * Name collisions are resolved by prefixing with the app label
   * Apps can extend SHELL_PLUS_APP_PREFIXES and SHELL_PLUS_DONT_LOAD
 
+* [Docker] Base image now contains curl, grep, less, sed, and pspg
+
 `2.5`_ – 2022-01-02
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