feat: adds secure cloud-function-core sub-module

[amandakarina]

Hey folks

This PR adds the initial version of sub-module for secure-cloud-functions, following the security best practices.

Could you, please, take a look on it?

Thanks!

[amandakarina]

/gcbrun

[amandakarina]

/gcbrun

[apeabody]

Thanks @amandakarina! - Would it be possible to add an example/test that uses this module, as currently it won't be covered by the INT tests.

[amandakarina]

Thanks @amandakarina! - Would it be possible to add an example/test that uses this module, as currently it won't be covered by the INT tests.

Hey @apeabody

Can we follow the standard used in secure-cloud-run?

An standalone example and the secure-cloud-function example? Those examples use the composition module (to be done) to be tested.

[apeabody]

Thanks @amandakarina! - Would it be possible to add an example/test that uses this module, as currently it won't be covered by the INT tests.

Hey @apeabody

Can we follow the standard used in secure-cloud-run?

An standalone example and the secure-cloud-function example? Those examples use the composition module (to be done) to be tested.

Sure, sounds good to me!

[gtsorbo]

Thanks for the PR! Provided a few comments

[gtsorbo]

Few small changes, then LGTM, thanks!