[registry-facade] Support blob caching in Redis

[csweichel]

Description

This PR adds Redis-based caching for manifests and blogs to registry-facade. This dramatically speeds up manifest assembly.

Related Issue(s)

Fixes #9006

Don't know what happened with #9028. This is a replacement.

Note: most commits are shared with #9005. Only last commit is actually new.

How to test

# install oci-tool
go install github.com/csweichel/coi-tool@latest

# start redis
docker run --name redis -p 6379:6379 -d redis

# start registry-facade
cd components/registry-facade
go run main.go run example-config.json

# pull a manifest
time oci-tool fetch --insecure manifest localhost:9090/fixed/foo:latest

# pull a manifest again - observe the difference in time
time oci-tool fetch --insecure manifest localhost:9090/fixed/foo:latest

# pull a different manifest - observe that it took less than the original 2 seconds
time oci-tool fetch --insecure manifest localhost:9090/fixed/bar:latest

# pull a different manifest again - observe the difference in time
time oci-tool fetch --insecure manifest localhost:9090/fixed/bar:latest

Release Notes

Improve workspace startup time through improved manifest assembly

[csweichel]

/werft run with-clean-slate

👍 started the job as gitpod-build-cw-regfac-redis.5

[aledbf]

LGTM