github: set -a when building with flags

[corverroos]

Also use -a flag to force rebuild when setting -ldflags when overriding tagged versions.

Since -ldflags=-X path/to/package.Var=foo contains a space inside the value, the only way I could get this to work is to provide it via an additional GO_BUILD_FLAG_2 variable. The other option would be wrangling arrays and splitting using something like IFS=' ' read -ra BUILD_ARGS <<< "$OPTIONAL_BUILD_ARGS" but I feel this is more verbose but simpler to understand.

category: misc
ticket: #2270

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.10 ⚠️

Comparison is base (ef9266a) 53.83% compared to head (1d78b4f) 53.74%.

Additional details and impacted files

@@              Coverage Diff               @@
##           main-v0.16    #2274      +/-   ##
==============================================
- Coverage       53.83%   53.74%   -0.10%     
==============================================
  Files             188      188              
  Lines           25536    25536              
==============================================
- Hits            13747    13724      -23     
- Misses          10101    10128      +27     
+ Partials         1688     1684       -4     

see 9 files with indirect coverage changes

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