Force rebuild of an image

[rzikm]

Can we trigger rebuild of fedora-34-helix image?
The dockerfile contains instructions to pull and build newest msquic and we'd like to consume the newer version in dotnet/runtime.

[mthalman]

Working on it. Blocked by #619.

[mthalman]

mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-34-helix-20220523150939-4f64125