Compressing APKs for storage/download

examples:

du -sh *
57M	app.organicmaps_22121812.apk
42M	app.organicmaps_22121812.apk.gz
41M	app.organicmaps_22121812.apk.zst
55M	chat.simplex.app_92.apk
50M	chat.simplex.app_92.apk.gz
50M	chat.simplex.app_92.apk.zst
102M	com.github.howeyc.crocgui_28.apk
50M	com.github.howeyc.crocgui_28.apk.gz
23M	com.github.howeyc.crocgui_28.apk.zst
32M	com.junkfood.seal_10814.apk
30M	com.junkfood.seal_10814.apk.gz
30M	com.junkfood.seal_10814.apk.zst
101M	im.vector.app_40105220.apk
93M	im.vector.app_40105220.apk.gz
93M	im.vector.app_40105220.apk.zst
185M	net.osmand.plus_4308.apk
161M	net.osmand.plus_4308.apk.gz
159M	net.osmand.plus_4308.apk.zst
83M	network.loki.messenger.fdroid_3315.apk
52M	network.loki.messenger.fdroid_3315.apk.gz
51M	network.loki.messenger.fdroid_3315.apk.zst
79M	org.mozilla.fennec_fdroid_1091120.apk
71M	org.mozilla.fennec_fdroid_1091120.apk.gz
71M	org.mozilla.fennec_fdroid_1091120.apk.zst
158M	org.supertuxkart.stk_312.apk
155M	org.supertuxkart.stk_312.apk.gz
153M	org.supertuxkart.stk_312.apk.zst

note 0% compression ratio

unzip -lv com.github.howeyc.crocgui_28.apk | grep "\.so"
26271864  Stored 26271864   0% 00-00-1980 00:00 fd6af864  lib/armeabi-v7a/libcroc.so
26809088  Stored 26809088   0% 00-00-1980 00:00 1a4cf72c  lib/arm64-v8a/libcroc.so
26237998  Stored 26237998   0% 00-00-1980 00:00 8170eb1d  lib/x86/libcroc.so
27315394  Stored 27315394   0% 00-00-1980 00:00 7f4a2036  lib/x86_64/libcroc.so
unzip -lv network.loki.messenger.fdroid_3315.apk | grep "\.so"
   43160  Stored    43160   0% 01-01-1981 01:01 5b32cf35  lib/arm64-v8a/libaesgcm.so
 2046192  Stored  2046192   0% 01-01-1981 01:01 26631264  lib/arm64-v8a/libconscrypt_jni.so
 7135240  Stored  7135240   0% 01-01-1981 01:01 7bb6505f  lib/arm64-v8a/libjingle_peerconnection_so.so
   ...