Merge pull request #8619 from RoadieHQ/demo-of-processor-using-creds-provider-interface

processor, actions and readers to use gh creds interface

.changeset/cold-toes-sniff.md

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+---
+'@backstage/integration': patch
+---
+
+Adds a new GitHub credentials provider (DefaultGithubCredentialsProvider). It handles multiple app configurations. It looks up the app configuration based on the url.

.changeset/late-plums-act.md

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+---
+'@backstage/plugin-catalog-backend': patch
+---
+
+Allow a custom GithubCredentialsProvider to be passed to the GitHub processors.

.changeset/silent-nails-sleep.md

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+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+Allow a GitHubCredentialsProvider to be passed to the GitHub scaffolder tasks actions.

.changeset/stale-gorillas-mix.md

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+---
+'@backstage/backend-common': patch
+---
+
+The GithubUrlReader is switched to use the DefaultGithubCredentialsProvider