[FEATURE]: Ability to load specs in spack schema

[shahzebsiddiqui]

Please describe your feature

We should add support for spack load this can be useful for running tests or simply loading the package once its installed. We should add the following. Let's say if we were to test m4 we can load the package prior to testing it. This could be done as follows

buildspecs:
  spack_load_example:
    type: spack
    executor: generic.local.bash
    description: "Run spack load for m4 package and run tests"
    tags: [spack]
    spack:
      root: $HOME/spack
      load:
        options: '--only package'
        specs: [m4]
      test:
        run:
          specs: ['m4']
        results:
          option: "-l"

In the above test, the load refers to spack load and options refer to options that can be passed to spack load command with a list of specs defined by specs property. The below command would translate to spack load --only package m4

      load:
        options: '--only package'
        specs: [m4]

The order of where spack load command must be written in test must be done after spack install (if present) and before spack test (if present).

TODO

• Update spack schema to add support for load
• Add implementation of emitting spack load command in https://github.com/buildtesters/buildtest/blob/devel/buildtest/builders/spack.py. This would be in method generate_script see

  buildtest/buildtest/builders/spack.py

  Line 48 in 58f91fd

  def generate_script(self):

• Add example buildspec to demonstrate this example in https://github.com/buildtesters/buildtest/tree/devel/examples/spack
• Add valid and invalid example for testing with regression test see https://github.com/buildtesters/buildtest/tree/devel/buildtest/schemas/examples/spack.schema.json please put a valid and invalid example so we can test this works during regression test
• Add documentation in https://buildtest.readthedocs.io/en/devel/buildspecs/spack.html add this at bottom of file

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