Improve Dockerfile to reduce image size

[tdurieux]

Hi there,

What I did

I've made a small improvement to the Dockerfile that I think could help optimize the image size.

How I did it

• I added the --no-cache-dir to the pip command to disable the package cache.

Impact on the image size:

• Image size before repair: 453.77 MB
• Image size after repair: 429.87 MB
• Difference: 23.9 MB (5.27%)

How to verify it

• Apply the patch and verify that the image still build

Commit message

chore: remove pip cache from the Docker image

Description for the changelog

Remove the pip cache from the Docker image to reduce its size by 23.9 MB

I hope that you will find these changes useful to you. Let me know if you have any questions or concerns.

[codecov-commenter]

Codecov Report

Merging #3224 (cace604) into master (ae7d6d2) will increase coverage by 16.20%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #3224       +/-   ##
===========================================
+ Coverage   72.73%   88.93%   +16.20%     
===========================================
  Files          84       84               
  Lines       10580    10584        +4     
  Branches     2139     2207       +68     
===========================================
+ Hits         7695     9413     +1718     
+ Misses       2271      760     -1511     
+ Partials      614      411      -203     

Impacted Files	Coverage Δ
vyper/codegen/ir_node.py	91.03% <0.00%> (+1.72%)	⬆️
vyper/abi_types.py	83.33% <0.00%> (+1.78%)	⬆️
vyper/ast/signatures/function_signature.py	88.28% <0.00%> (+1.80%)	⬆️
vyper/codegen/arithmetic.py	84.71% <0.00%> (+2.02%)	⬆️
vyper/codegen/context.py	91.91% <0.00%> (+2.94%)	⬆️
vyper/semantics/types/primitives.py	92.50% <0.00%> (+3.50%)	⬆️
vyper/builtins/_signatures.py	97.64% <0.00%> (+3.52%)	⬆️
vyper/codegen/self_call.py	95.65% <0.00%> (+4.34%)	⬆️
vyper/codegen/module.py	97.70% <0.00%> (+5.74%)	⬆️
vyper/codegen/external_call.py	97.29% <0.00%> (+6.30%)	⬆️
... and 44 more

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