rust: Add Cargo.lock

[jlebon]

We've been seeing more breakage recently due to much of the Rust
ecosystem sticking to minimum rustc versions more recent than ours. A
lockfile now means we have to periodically update it, but at least we
have much better control over our CI system and when we want to spend
time resolving package bump conflicts vs. just trying to get a small
patch in.

[cgwalters]

@rh-atomic-bot r+ c9b6810

[rh-atomic-bot]

⌛ Testing commit c9b6810 with merge 9a3cd07...

[lucab]

👍 The idea is that top-level consumers (i.e. applications) lock their dependencies, so I think this makes sense even in the long term.

I don't know if you want to automate bumping them, but there are a few stale ones already:

$ cargo outdated -R

Name        Project  Compat  Latest  Kind    Platform
----        -------  ------  ------  ----    --------
gio-sys     0.6.0    ---     0.7.0   Normal  ---
glib        0.5.0    ---     0.6.1   Normal  ---
glib-sys    0.6.0    ---     0.7.0   Normal  ---
indicatif   0.9.0    ---     0.10.3  Normal  ---
serde_yaml  0.7.5    ---     0.8.8   Normal  ---

[jlebon]

I don't know if you want to automate bumping them, but there are a few stale ones already:

Heh thanks. I still need to get familiar with this workflow now. :) I can bump those, though let's do it in a separate PR so we can iterate against a known working base?

[rh-atomic-bot]

☀️ Test successful - status-atomicjenkins
Approved by: cgwalters
Pushing 9a3cd07 to master...

[jlebon]

I can bump those, though let's do it in a separate PR so we can iterate against a known working base?

#1720