add auto start from snapshot

[FineKe]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• [ ] Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #3193 (c0afb55) into dev (9483c69) will increase coverage by 6.66%. The diff coverage is 0.00%.

:exclamation: Current head c0afb55 differs from pull request most recent head 8518b52. Consider uploading reports for the commit 8518b52 to get more accurate results

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@@            Coverage Diff             @@
##              dev    #3193      +/-   ##
==========================================
+ Coverage   29.80%   36.46%   +6.66%     
==========================================
  Files          54      444     +390     
  Lines        5838    46606   +40768     
==========================================
+ Hits         1740    16995   +15255     
- Misses       3927    28346   +24419     
- Partials      171     1265    +1094     

Impacted Files	Coverage Δ
app/app.go	80.81% <0.00%> (-0.15%)	:arrow_down:
app/start_from_snapshot.go	0.00% <0.00%> (ø)

... and 389 files with indirect coverage changes