resolve issue 358

[d4rkstar]

Should resolve nuvolaris/nuvolaris#358.

Runtimes are referenced in a variable called RUNTIMES.

So now is possible to do:

1. specific language tagging and building

$ task image-tag RT=php
3.1.0-mastrogpt-php.2405170025
$ task build
Build php
[....]

The build will check for specific language in tag.

2. generic tagging

$ task image-tag 
3.1.0-mastrogpt.2405170026
$ task build
==> BUILDING RUNTIMES golang,nodejs,php,python
[....]

when building, all runtimes in RUNTIMES variable are build in sequence.

Is possible to build specific runtimes to build this way:

$ task build RUNTIMES=golang,nodejs
==> BUILDING RUNTIMES golang,nodejs
[....]

[sciabarracom]

I was expeting also a change in the .github/workflow

[d4rkstar]

Anyway: is the change in taskfile satisfactory?

[d4rkstar]

Hello @sciabarracom, i splitted tasks for tag and build-and-push for each language. Let me know if this is ok or other changes are required.