Use release version of Python 3.9 in tests

Merge pull request #345 from netbox-community/enable_sponsoring ...

Enable Sponsoring Button

Create FUNDING.yml to enable sponsoring

Enable test on Python 3.9

Move default source image to Python 3.8

Merge pull request #274 from tobiasge/optimise-builds ...

Optimise builds

probot/no-response configuration

Changed "build-branches.sh" to "build-next.sh" ...

The old version of "build-branches.sh" skipped the pushing of images when one of
them didn't change its sources. When looking at the Netbox branches I noticed
that the "master" branch only changes when there is a new release. Because we
build the new releases anyway in "build-latest.sh" that leaves "develop" and
"develop-*" which change regularly. The new script "build-next.sh" is responsible
for building "develop-*" as the next major release of Netbox. The build of
"develop" is moved to the Github Action build matrix. This has the additional
advantage of being faster because more builds are done in parallel.

Enable push workflow for PRs

Merge pull request #229 from netbox-community/fix_shields ...

Readme Cleanup

Disable python 3.9 tests once more

Update docker inspect command in bug_report template

Fix typo in PR template

Fix build status badge

Ask for a release note entry

Fix typo in pull request template

Check that `develop` is target in PR ...

This is an update to the PR template.
It mostly adds text and some checks related to how good the template
is filled in and whether the `develop` branch was selected as base.

Fix failing GH Action

Enable tests with Python 3.9

Netbox is not yet compatible with Python 3.9

Building the Docker image with Github Actions

N/A when there's no issue

Pull request template suggestion

Adds more labels to the Dockerfile ...

It also updates the README and the bug_report template to reflect
the changes. Additionally, in the README some relevant shields from
shields.io are added.

The labels follow [label-schema.org][lsorg] and the [OpenContainer
image spec, section annotations][ocis], specifications.

[lsorg]: http://label-schema.org/rc1/
[ocis]: https://github.com/opencontainers/image-spec/blob/master/annotations.md

A new issue category for feature/change requests

Delete issue_template.md

Update issue templates

Update references to netboxcommunity

Mention the #netbox-docker Slack channel

✏️ Added an issue_template ...

With which I hope that people provide some basic information about
their project right away instead only on request.