Distribution: Add FlowForge to Cloud Marketplaces

[ZJvandeWeg]

Description

All major cloud providers have a marketplace:

• [ ] AWS: https://aws.amazon.com/marketplace
• [ ] GCP: https://cloud.google.com/marketplace
• [ ] Azure: https://azuremarketplace.microsoft.com/en-us/home
• [x] DO: https://marketplace.digitalocean.com/

And many more, which might be an interesting way to distribute FlowForge, both Premium and Open-Source.

### Activities
- [ ] flowforge/flowforge/issues/1632
- [ ] flowforge/flowforge/issues/1806
- [ ] https://github.com/flowforge/flowforge/issues/1927
- [ ] https://github.com/flowforge/flowforge/issues/1942

[ZJvandeWeg]

@hardillb is working on the DO implementation of this issue already, adding this epic to 1.4 to reflect that.

[ZJvandeWeg]

Community request to support Linode: https://www.linkedin.com/feed/update/urn:li:activity:7023318928613367808?commentUrn=urn%3Ali%3Acomment%3A%28activity%3A7023318928613367808%2C7028621961807224833%29