Only push the container to ghcr in case the repository is owned by the
freifunk-gluon organization.

THis avoids failing CI on forks.

Signed-off-by: David Bauer <mail@david-bauer.net>

Bumps [docker/login-action](https://github.com/docker/login-action) from 65b78e6e13532edd9afa3aa52ac7964289d1a9c1 to b4bedf8053341df3b5a9f9e0f2cf4e79e27360c6.
- [Release notes](https://github.com/docker/login-action/releases)
- [Commits](https://github.com/docker/login-action/compare/65b78e6e13532edd9afa3aa52ac7964289d1a9c1...b4bedf8053341df3b5a9f9e0f2cf4e79e27360c6

)

---
updated-dependencies:
- dependency-name: docker/login-action
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from f2a1d5e99d037542a71f64918e516c093c6f3fc4 to 4c1b68d83ad20cc1a09620ca477d5bbbb5fa14d0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/f2a1d5e99d037542a71f64918e516c093c6f3fc4...4c1b68d83ad20cc1a09620ca477d5bbbb5fa14d0

)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4

)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7 to 879dcbb708d40f8b8679d4f7941b938a086e23a7.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](https://github.com/docker/metadata-action/compare/9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7...879dcbb708d40f8b8679d4f7941b938a086e23a7

)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

The docker container on PR action is broken in case the PR is not opened
within the Gluon project.

Remove the build on PR so the pipeline does not fail for third party
PRs.

Signed-off-by: David Bauer <mail@david-bauer.net>

This adds a workflow to push the build-container described in Gluons
Dockerfile to the freifunk-gluon organizations container registry.

This will create a image

 - For every push to master
 - For every tagged version
 - For every PR against master

Signed-off-by: David Bauer <mail@david-bauer.net>