(CI/winnie) simplify code of winnie build script

[cvvergara]

Fixes #2708

Changes proposed in this pull request:

• Script for winnie is simplified
• TAPTEST variable added to verbose test a particular directory
  • suitable for developers
• DEBUG variable added
  • When true: Compilation is verbose, script variable contents are shown, build_type is "Debug"
  • When false: build_type is "Release"
• BOOST_VER to be captured, defaults to 1.78.0

Set up in winnie:
pgRouting_PGVersionEDB: TAPTEST = "", DEBUG= not set (aka false), BOOST_VER=1.78.0
Branch develop: TAPTEST = "", DEBUG=true, BOOST_VER=1.78.0
Branch main: TAPTEST = "", DEBUG=true, BOOST_VER=1.78.0
For other branches like pgRouting_matrix_branch_tagged_3_7 will catch the defaults from pgRouting_PGVersionEDB on the new variables.

@pgRouting/admins