Add GitHub Action workflow to update Miniforge

[jakirkham]

To aid in keeping Miniforge up-to-date in images, it may help to have a GitHub Action that checks for an existing release and if it finds one updates the version...

docker-images/scripts/run_commands

Line 8 in 7023391

export miniforge_version="24.7.1-2"

...as well as associated checksums...

docker-images/scripts/run_commands

Line 13 in 7023391

export conda_chksum="636f7faca2d51ee42b4640ce160c751a46d57621ef4bf14378704c87c5db4fe3"

docker-images/scripts/run_commands

Line 17 in 7023391

export conda_chksum="bb5d14dac73b85da8fbe386cdd3c94022a468563a0c55e6b20a58d82b55a9737"

docker-images/scripts/run_commands

Line 21 in 7023391

export conda_chksum="7bf60bce50f57af7ea4500b45eeb401d9350011ab34c9c45f736647d8dba9021"