api: split pulling API changes and regenerating new API

For checking wether the api was tempered with, we need separate action,
that just checks the code against the currently pulled spec.

This introduces two subactions for `npx api`.
These are `npx api:generate` and `npx api:pull`.

api/README.md

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+# API
+
+This folder contains generated code for API endpoints needed by this repo.
+
+## Updating API changes
+
+To pull new API changes and regenerating the code run
+
+```shell
+npm run api
+```
+
+## Regenerating the code only
+
+To regenerate the code only, run
+
+```shell
+npm run api:generate
+```

api/codegen.sh

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+#!/bin/bash
+
+# Run commands in the background using & operator
+npx @rtk-query/codegen-openapi ./api/config/imageBuilder.ts &
+npx @rtk-query/codegen-openapi ./api/config/rhsm.ts &
+npx @rtk-query/codegen-openapi ./api/config/contentSources.ts &
+npx @rtk-query/codegen-openapi ./api/config/provisioning.ts &
+npx @rtk-query/codegen-openapi ./api/config/edge.ts &
+
+# Wait for all background jobs to finish
+wait
+

api/pull.sh

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+#!/bin/bash
+
+# Download the most up-to-date imageBuilder.yaml file and overwrite the existing one
+curl https://raw.githubusercontent.com/osbuild/image-builder/main/internal/v1/api.yaml -o ./api/schema/imageBuilder.yaml