chore(java): detect sample-secrets in build.sh

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[codecov]

Codecov Report

Merging #690 (d27054f) into master (e350fe3) will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #690      +/-   ##
============================================
+ Coverage     83.45%   83.49%   +0.04%     
  Complexity     1198     1198              
============================================
  Files           110      110              
  Lines          7309     7309              
  Branches        383      383              
============================================
+ Hits           6100     6103       +3     
+ Misses         1007     1006       -1     
+ Partials        202      200       -2     

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/bigtable/emulator/v2/Emulator.java	59.83% <0.00%> (-0.82%)	14.00% <0.00%> (ø%)
...v2/stub/metrics/HeaderTracerStreamingCallable.java	88.23% <0.00%> (+5.88%)	3.00% <0.00%> (ø%)
...ata/v2/stub/metrics/HeaderTracerUnaryCallable.java	100.00% <0.00%> (+10.52%)	3.00% <0.00%> (ø%)

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