Cache for pipenv & apt

[tcely]

• Consolidate apk & apt commands
• Consolidate ENV layers
• Consolidate RUN layers
• Remove unused variables
• Remove packages that are no longer needed
• Bind mount /app/Pipfile

/cache is now a tmpfs mount that has a cache mount on top for pipenv to use.

apt has cache mounts in the standard places:

• /var/lib/apt
• /var/cache/apt

This should significantly speed up the arm64 builds because two wheels were built on that architecture versus only one for amd64 builds.

[meeb]

Thanks! Looks fine to me.

[tcely]

#74 132.0   Building wheel for libsass (setup.py): started
#74 1373.0   Building wheel for libsass (setup.py): finished with status 'done'
#74 1373.0 
#74 1373.1   Created wheel for libsass: filename=libsass-0.23.0-cp311-abi3-linux_aarch64.whl size=12880501 sha256=2313e5a93a91af40a4f318c6ab025e4502a3201fa7fe9352ae6ff99cb1c10f47
#74 1373.1 
#74 1373.1   Stored in directory: /cache/pipenv/wheels/a1/a1/53/148dc44ce1a0cfaee1213108605bea345e84e35cf7cc58ee21

That's about 21 minutes to build the libsass .whl (12.29 MiB) on arm64 that hopefully won't be in the next build of this stage.