Use apt-get autoremove to clean up dependencies in Docker

[andylizi]

Currently there are left-over packages remain in the docker image:

The following packages were automatically installed and are no longer required:
    dirmngr gnupg-l10n gnupg-utils gpg gpg-agent gpg-wks-client gpg-wks-server
    gpgconf gpgsm libassuan0 libksba8 libnpth0 pinentry-curses
Use 'apt autoremove' to remove them.

[andylizi]

Strange, the CI is failing. I don't think this is caused by this PR?

 Error: failed to run main module `abort.c.---.wasm`
 
 Caused by:
-    0: failed to invoke `run` function
-    1: error while executing at wasm backtrace:
-    2: wasm trap: wasm `unreachable` instruction executed
+    0: import `wasi:cli/[email protected]` has the wrong type
+    1: instance export `exit` has the wrong type
+    2: expected func found nothing
make: *** [Makefile:54: check] Error 1

[abrown]

Looks good to me. Once #382 merges, I believe we should be able to rebase this to fix the unrelated build failure.