fix: fix VERGEN_GIT_SHA population in Docker image (#4503)

### Description

Was accidentally removed in #4438. Wonder if there's an easy way to have
tests fail if this doesn't work?

### Drive-by changes

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### Related issues

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- Fixes #[issue number here]
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### Backward compatibility

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using this infra tooling?

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### Testing

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Co-authored-by: Paul Balaji <10051819+paulbalaji@users.noreply.github.com>

.github/workflows/rust-skipped.yml

@@ -5,15 +5,15 @@ on:
   push:
     branches: [main]
     paths-ignore:
-      - 'rust/**'
+      - 'rust/main/**'
+      - 'rust/sealevel/**'
       - .github/workflows/rust.yml
   pull_request:
     branches: [main]
     paths-ignore:
-      - 'rust/**'
+      - 'rust/main/**'
+      - 'rust/sealevel/**'
       - .github/workflows/rust.yml
-  # Support for merge queues
-  merge_group:
 
 env:
   CARGO_TERM_COLOR: always

rust/Dockerfile

@@ -25,6 +25,8 @@ COPY rust/sealevel rust/sealevel
 COPY rust/main/Cargo.toml rust/main/.
 COPY rust/main/Cargo.lock rust/main/.
 
+# Required for VERGEN_GIT_SHA to be populated
+COPY .git .git
 
 WORKDIR /usr/src/rust/main