ci: update openwrt/gh-action-sdk

[a-gave]

This is an attempt to re-enable the build of lime-packages via ci for versions based on openwrt-19.07.10, and enable it also for versions based on openwrt-22.03.5.

This create a distinct workflow file for older releases , linking them with the sdk related to openwrt-19.07.10.

This update also the default workflow build.yml to fix the error /entrypoint.sh: line 8: cd: /home/build/openwrt/: No such file or directory. This seems due to an update in the directory structure in https://github.com/openwrt/gh-action-sdk

[codecov-commenter]

Codecov Report

Merging #1052 (626dd32) into master (bf158a1) will increase coverage by 0.40%. Report is 71 commits behind head on master. The diff coverage is 100.00%.

:exclamation: Current head 626dd32 differs from pull request most recent head e1fbfb9. Consider uploading reports for the commit e1fbfb9 to get more accurate results

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@@            Coverage Diff             @@
##           master    #1052      +/-   ##
==========================================
+ Coverage   79.27%   79.67%   +0.40%     
==========================================
  Files          53       53              
  Lines        4444     4542      +98     
==========================================
+ Hits         3523     3619      +96     
- Misses        921      923       +2     

Files Changed	Coverage Δ
...ages/lime-system/files/usr/lib/lua/lime/config.lua	97.72% <100.00%> (+0.03%)	:arrow_up:
...ges/lime-system/files/usr/lib/lua/lime/network.lua	78.39% <100.00%> (+0.20%)	:arrow_up:
...tuck-wa/files/usr/lib/lua/lime/wifi_unstuck_wa.lua	100.00% <100.00%> (ø)
tests/fakes/iwinfo.lua	98.13% <100.00%> (+1.02%)	:arrow_up:

... and 4 files with indirect coverage changes

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