feat: Added reproducible build using SourceScan Docker image

[frol]

Reproducible builds are part of cargo-near nowadays, but that would require to migrate to near-sdk-rs 5.2+, so this is a simple shortcut.

@race-of-sloths include

[race-of-sloths]

@frol Thank you for your contribution! Your pull request is now a part of the Race of Sloths!

Current status: executed

Reviewer	Score
@race-of-sloths	1

Your contribution is much appreciated with a final score of 1!
You have received 10 Sloth points for this contribution

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[race-of-sloths]

🥁 Score it!

@ilblackdragon, please score the PR with @race-of-sloths score [1/2/3/5/8/13]. The contributor deserves it.
If no scoring is provided within 24 hours, this PR will be scored as 1 🦥

[ilblackdragon]

@race-of-sloths score 1

[race-of-sloths]

⏰️ Scoring closed

24 hours have already passed since the merge