fix: remove py 3.7 and add apptainer 1.1.5

[satra]

No description provided.

[kaczmarj]

looks great. to speed up the ci, we can install the prebuilt deb files for apptainer. apptainer github releases have these debs. we would have to install the "regular" deb as well as the deb that adds suid capabilities.

wget https://github.com/apptainer/apptainer/releases/download/v1.1.5/apptainer_1.1.5_amd64.deb
wget https://github.com/apptainer/apptainer/releases/download/v1.1.5/apptainer-suid_1.1.5_amd64.deb
sudo apt-get install --yes ./apptainer*

and then we would not have to wait for apptainer to compile.

[satra]

thanks @kaczmarj - i'll add that. currently fixing tests on master.

[codecov]

Codecov Report

Base: 83.74% // Head: 83.72% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (218697a) compared to base (7ae8b29).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #490      +/-   ##
==========================================
- Coverage   83.74%   83.72%   -0.02%     
==========================================
  Files          11       11              
  Lines        1015     1014       -1     
==========================================
- Hits          850      849       -1     
  Misses        165      165              

Impacted Files	Coverage Δ
neurodocker/cli/generate.py	90.95% <0.00%> (-0.05%)	⬇️

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