Switch from Bintray to download.falco.org

[leogr]

Motivation

Since Bintray has been deprecated and is going into the sunset on May 1st, we need to migrate artifacts and update CI jobs that rely on it.
Moreover, our infrastructure now provides an S3 bucket that is publicly accessible from download at https://download.falco.org/, which is suitable for the purpose.

Feature

• Copy artifacts from https://dl.bintray.com/falcosecurity/dependencies/ to https://download.falco.org/dependencies/
• Update the build system to reflect the new URL of dependencies 👉 build: fetch build deps from download.falco.org #1572
• Copy artifacts from https://dl.bintray.com/falcosecurity/fixtures/ to https://download.falco.org/fixtures/
• Update the test suit to reflect the new URLs of fixtures not used atm
• Recreate packages repository (bin, bin-dev, deb, deb-dev, rpm, rpm-dev) under https://download.falco.org/ and copy related files from https://dl.bintray.com/falcosecurity/
• Create a mechanism to update DEB and RPM repositories (previously managed by Bintray)
• Modify the current packages publishing jobs
• Update the base URL in the RPM repo manifest that the documentation provides 👉 https://github.com/falcosecurity/falco-website/tree/master/static/repo 👉 Switch download links and packages repos to download.falco.org falco-website#405
• Update the documentation accordingly 👉 Switch download links and packages repos to download.falco.org falco-website#405
• Update download links (e.g https://github.com/falcosecurity/falco/blob/master/README.md#latest-releases)
• Update download link templates in instructions for releasing (e.g https://github.com/falcosecurity/falco/blob/master/RELEASE.md#2-update-the-github-release)
• If not already present into https://dl.bintray.com/falcosecurity/driver/, copy the missing artifacts from https://dl.bintray.com/falcosecurity/driver/
• update driverkit (see update(build): fetch deps from download.falco.org driverkit#93)

Notes:

• I've realized that fixtures are not actually fetched from https://dl.bintray.com/falcosecurity/fixtures/
• We don't have i386 binaries and no i386 packages published under https://dl.bintray.com/falcosecurity/deb/dists/stable/main/binary-i386/ , thus I will not include i386 in the new debian repository
• We come up with the conclusion that only pre-built drivers configured in test-infra should be published. Btw, all driver versions previously published on Bintray are already present in download.falco.org.

Alternatives

I don't see any alternative since Bintray is going to be shut down soon.

Additional context

The 0.28.0 release is the last chance to test the CI automation of stable packages before the Bintray shutdown.

[leogr]

/assign