Packages with epoch in their filename are not marked as GOOD

[foutrelis]

Seeing the following error on the rebuilderd worker and the package is shown as BAD on https://reproducible.archlinux.org/

[2021-11-25T00:30:18Z INFO  rebuilderd_worker::rebuild] Comparing "/tmp/rebuilderd7RU43S/inputs/re2-1:20211101-1-x86_64.pkg.tar.zst" with "/tmp/rebuilderd7RU43S/out/re2-1:20211101-1-x86_64.pkg.tar.zst"
[2021-11-25T00:30:18Z INFO  rebuilderd_worker::rebuild] Files are identical, marking as GOOD
[2021-11-25T00:30:18Z INFO  rebuilderd_worker::rebuild] Generating signed link
[2021-11-25T00:30:18Z ERROR rebuilderd_worker] Unexpected error while rebuilding package package: Failed to generate in-toto attestation: illegal argument: Path cannot contain ":"
[2021-11-25T00:30:18Z INFO  rebuilderd_worker] Sending build report to rebuilderd...

[foutrelis]

Whoops, duplicate of #94.