fix: use enterprise token from env as fallback

[chandumlg]

Description

Falling back to enterprise token read from env (if not provided as an ldflag)

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[atzoum]

@chandumlg is this change needed for 1.3.0? If so, please change the target to release/1.3.x branch

[codecov]

Codecov Report

Base: 45.60% // Head: 45.45% // Decreases project coverage by -0.14% ⚠️

Coverage data is based on head (30edaec) compared to base (0d061ff).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/1.3.x    #2667      +/-   ##
=================================================
- Coverage          45.60%   45.45%   -0.15%     
=================================================
  Files                287      287              
  Lines              47790    47790              
=================================================
- Hits               21793    21722      -71     
- Misses             24619    24691      +72     
+ Partials            1378     1377       -1     

Impacted Files	Coverage Δ
main.go	0.00% <0.00%> (ø)
processor/stash/stash.go	41.56% <0.00%> (-24.28%)	⬇️
services/rsources/handler.go	70.83% <0.00%> (-1.39%)	⬇️
jobsdb/backup.go	76.30% <0.00%> (-0.35%)	⬇️
jobsdb/jobsdb.go	73.39% <0.00%> (-0.30%)	⬇️
router/router.go	74.04% <0.00%> (+0.18%)	⬆️

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