Add Fedora packaging

[LecrisUT]

Add packaging support for Fedora. This would require installing packit on this repo.

This includes a more complete integration tests (find_package and FetchContent).

Depends-on: #262

[LecrisUT]

@pboettch This one is ready now. Can you install packit on this repository?

[pboettch]

I don't have the time to understand what I have to do for them moment.

[pboettch]

I merged it, but I didn't install packit on this repo. What do I have to to?

[LecrisUT]

Basically, just install: https://github.com/marketplace/packit-as-a-service. Normally you need a fedora account, but since I will help with the packaging, we can use my account.

[pboettch]

I installed it, now what? Do you need more access to this repo?

[LecrisUT]

Not really, you should have been tagged on an issue to link to a fedora account, can ignore that one.

/packit build

[packit-as-a-service[bot]]

Project github.com/pboettch/json-schema-validator.git is not on our allowlist! See https://packit.dev/docs/guide/#2-approval

[packit-as-a-service[bot]]

Project github.com/pboettch/json-schema-validator.git is not on our allowlist! See https://packit.dev/docs/guide/#2-approval

[pboettch]

I saw that you found it.

[LecrisUT]

Now it is resolved

/packit build

[packit-as-a-service[bot]]

Project github.com/pboettch/json-schema-validator.git is not on our allowlist! See https://packit.dev/docs/guide/#2-approval

[packit-as-a-service[bot]]

We were not able to find or create Copr project lecris/json-schema-validator specified in the config with the following error:

Copr project lecris/json-schema-validator not found.

---

Please check your configuration for:

1. typos in owner and project name (groups need to be prefixed with @)
2. whether the project name doesn't contain not allowed characters (only letters, digits, underscores, dashes and dots must be used)
3. whether the project itself exists (Packit creates projects only in its own namespace)
4. whether Packit is allowed to build in your Copr project
5. whether your Copr project/group is not private

[packit-as-a-service[bot]]

We were not able to find or create Copr project lecris/json-schema-validator specified in the config with the following error:

Copr project lecris/json-schema-validator not found.

---

Please check your configuration for:

1. typos in owner and project name (groups need to be prefixed with @)
2. whether the project name doesn't contain not allowed characters (only letters, digits, underscores, dashes and dots must be used)
3. whether the project itself exists (Packit creates projects only in its own namespace)
4. whether Packit is allowed to build in your Copr project
5. whether your Copr project/group is not private

[packit-as-a-service[bot]]

We were not able to find or create Copr project lecris/json-schema-validator specified in the config with the following error:

Copr project lecris/json-schema-validator not found.

---

Please check your configuration for:

1. typos in owner and project name (groups need to be prefixed with @)
2. whether the project name doesn't contain not allowed characters (only letters, digits, underscores, dashes and dots must be used)
3. whether the project itself exists (Packit creates projects only in its own namespace)
4. whether Packit is allowed to build in your Copr project
5. whether your Copr project/group is not private

[LecrisUT]

Ok, can check the "checks" and the CI is running there. I might need to do a bit of maintenance to modernize that a bit, and fix the issues :D