docker: Use pregenerated keys in docker private network

[algochoi]

Summary

Docker changes:

• Mount the participation keys to the /etc/algorand/keys directory. This is done using --mount when the docker container is started up
• If a private network is going to be started, use that directory if there are keys.

#5699

Test Plan

Manually generated keys from a custom template, then built and started docker image.

Pregenerate keys:
goal network pregen -t some_template.json -p pregen_k

Build the image (from root dir):

docker build \
    -t algochoi/algod:pregen-test  \
    --build-arg TARGETARCH=amd64 --no-cache \
    . 

Run (mounting the template and data directory is optional, and -v and --mount are interchangeable with slight differences in syntax):

docker run --rm -it --name algod-pregen-run \
    -p 4190:8080 \
    -e TOKEN=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \
    --mount type=bind,source="$(pwd)"/some_template.json,target=/etc/algorand/template.json \
    --mount type=bind,source="$(pwd)"/pregen_k,target=/etc/algorand/keys \
    --mount type=bind,source="$(pwd)"/docker_data,target=/algod/data algochoi/algod:pregen-test

[codecov]

Codecov Report

Merging #5728 (db8e897) into master (02b99bb) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5728      +/-   ##
==========================================
+ Coverage   55.54%   55.56%   +0.01%     
==========================================
  Files         476      476              
  Lines       66853    66853              
==========================================
+ Hits        37131    37144      +13     
+ Misses      27193    27186       -7     
+ Partials     2529     2523       -6     

see 17 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[winder]

Command to generate keys inside the container end export them to a mounted volume

docker run --rm -it \
    -p 4190:8080 \
    --name pregen \
    -v /tmp/big_keys.json:/etc/algorand/template.json \
    -v (pwd)/pregen:/algod/pregen \
    --entrypoint "/node/bin/goal" \
    algorand/algod:nightly network pregen -t /etc/algorand/template.json -p /algod/pregen

Using the same template, these keys can be provided to quickly start a private network:

docker run --rm -it --name algod-pregen-run \
    -p 4190:8080 \
    -v /tmp/big_keys.json:/etc/algorand/template.json \
    -v (pwd)/pregen:/etc/algorand/keys \
    -v (pwd)/docker_data:/algod/data \
    wwinder/algod:pregen

[winder]

Closing in favor of #5735