feat!: Improve Pull Request Template & Contributing Guidelines (#750)

* feat: improve documentation and require changelog

Signed-off-by: Oliver Bähler <oliverbaehler@hotmail.com>

* Bump Versions

Signed-off-by: Oliver Bähler <oliverbaehler@hotmail.com>

* Bump argo-rollouts

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* Apply suggestions from code review

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* Reword Artifacthub -> Artifact Hub

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>
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@ -2,6 +2,54 @@
Argo Helm is a collection of **community maintained** charts. Therefore we rely on you to test your changes sufficiently.
# Pull Requests
All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose. Consult [GitHub Help](https://help.github.com/articles/about-pull-requests/) for more information on using pull requests. See the above stated requirements for PR on this project.
## Versioning
Each chart's version follows the [semver standard](https://semver.org/). New charts should start at version `1.0.0`, if it's considered stable. If it's not considered stable, it must be released as [prerelease](#prerelease).
Any breaking changes to a chart (backwards incompatible) require:
* Bump of the current Major version of the chart
* State possible manual changes for this chart version in the `Upgrading` section of the chart's `README.md.gotmpl` ([See Upgrade](#upgrades))
### Immutability
Each release for each chart must be immutable. Any change to a chart (even just documentation) requires a version bump. Trying to release the same version twice will result in an error.
### Artifact Hub Annotations
Since we release our charts on Artifact Hub we encourage making use of the provided chart annotations for Artifact Hub.
* [https://artifacthub.io/docs/topics/annotations/helm/](https://artifacthub.io/docs/topics/annotations/helm/)
#### Changelog
We want to deliver transparent chart releases for our chart consumers. Therefore we require a changelog per new chart release.
Changes on a chart must be documented in a chart specific changelog in the `Chart.yaml` [Annotation Section](https://helm.sh/docs/topics/charts/#the-chartyaml-file). For every new release the entire `artifacthub.io/changes` needs to be rewritten. Each change requires a new bullet point following the pattern `- "[{type}]: {description}"`. You can use the following template:
```
name: argo-cd
version: 3.4.1
...
annotations:
artifacthub.io/changes: |
- "[Added]: Something New was added"
- "[Changed]: Changed Something within this chart"
- "[Changed]: Changed Something else within this chart"
- "[Deprecated]: Something deprecated"
- "[Removed]: Something was removed"
- "[Fixed]: Something was fixed"
- "[Security]": Some Security Patch was included"
```
# Testing
## Testing Argo Workflows Changes
Minimally:
@ -96,4 +144,4 @@ The linting can be invoked manually with the following command:
## Publishing Changes
Changes are automatically publish whenever a commit is merged to master. The CI job (see `./.github/workflows/publish.yml`).
Changes are automatically publish whenever a commit is merged to master. The CI job (see `./.github/workflows/publish.yml`).