Update protoc, add dependabot

[haydentherapper]

I was running into an error with the Docker container updating its apt cache, updating to the latest protoc image fixed it.

Also added dependabot to keep it up to date.

Summary

Release Note

Documentation

[haydentherapper]

@woodruffw One other thing I noticed, there's a file permissions issue with the created codegen for rust. When I run make again, I get:

Building development docker image
docker build -t protobuf-specs-build .
error checking context: no permission to read from '/usr/local/google/home/hblauzvern/protobuf-specs/gen/pb-rust/codegen/target/debug/incremental/sigstore_protobuf_specs_codegen-219stdjo4fqmo/s-gn63o9g6ki-d2358w.lock'
make: *** [Makefile:66: docker-image] Error 1

Do you know where I should update for this?

[haydentherapper]

There's reports of this issue in rust-lang/cargo#6757, so I assume we just need to chown some directory

[woodruffw]

One other thing I noticed, there's a file permissions issue with the created codegen for rust. When I run make again, I get:

Hmm, I haven't seen this before. I wonder if this is because cargo is trying to read/write to a directory that's shared with the host? I'll try and repro tomorrow.

[kommendorkapten]

I was running into an error with the Docker container updating its apt cache, updating to the latest protoc image fixed it.

Did you try running make docker-image-no-cache @haydentherapper ?

I was running into similar issues so that's why I added the target drop the caches.

[jleightcap]

There's reports of this issue in rust-lang/cargo#6757, so I assume we just need to chown some directory

I ran into this intermittently only when building the same rust target multiple times in a row, so I don't believe this should affect anything other than develop-time. My workaround was chown -R gen/pb-rust/codegen/target as you mention -- I'm not well-versed in docker container best practices, but chown-ing would at worst be a no-op, I imagine?

[haydentherapper]

Running sudo chown -R $(whoami) gen/pb-rust/codegen/target resolves this. Not sure why this is needed though, as files generated with the container for other languages don't have this issue.