fix: parse firebase private key env

[alexruzenhack]

Acceptance Criteria

• fix: firebase env parse
• refactor: parse FIREBASE_PRIVATE_KEY

A direct deployment using the serverless API does not interfere with ENV values. However, a deployment through the CI pipeline interferes with ENV values by escaping them. To reverse this effect we need to restore its original value.

Security Checklist

• [ ] Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov[bot]]

Codecov Report

Merging #386 (31db4d3) into dev (23cacf8) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #386      +/-   ##
==========================================
+ Coverage   95.40%   95.41%   +0.01%     
==========================================
  Files          37       37              
  Lines        2329     2336       +7     
  Branches      274      276       +2     
==========================================
+ Hits         2222     2229       +7     
  Misses        107      107              

Impacted Files	Coverage Δ
src/utils/pushnotification.utils.ts	100.00% <100.00%> (ø)

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