Always provide -y to apt-get install

[yarikoptic]

Ref: workaround was attempted at https://github.com/neuronets/datalad-action/pull/1/files

Origin: trying to use datalad-installer on a pristine'ish Debian AMI on AWS.

• confirm that solves the issue for @hvgazula @aaronkanzer

note: next aspect is that while trying on that AMI -- it failed to install because there were no prior apt-get update run and some package information was outdated. But it is a separate issue

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2196b1b) 65.57% compared to head (0fc1b1d) 65.57%.

Files	Patch %	Lines
src/datalad_installer.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #194   +/-   ##
=======================================
  Coverage   65.57%   65.57%           
=======================================
  Files           1        1           
  Lines        1644     1644           
  Branches      408      408           
=======================================
  Hits         1078     1078           
  Misses        466      466           
  Partials      100      100           

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