chore(server): prepared command

[rustatian]

Reason for This PR

• possible memory leak on the env allocations.

Description of Changes

• Prepare command and reuse in the server's Init method.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #165 (5ee541e) into master (fc3b848) will decrease coverage by 0.05%. The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
- Coverage   67.44%   67.38%   -0.06%     
==========================================
  Files         134      134              
  Lines       10477    10483       +6     
==========================================
- Hits         7066     7064       -2     
- Misses       2671     2678       +7     
- Partials      740      741       +1     

Impacted Files	Coverage Δ
server/oninit.go	74.00% <20.00%> (-6.44%)	:arrow_down:
server/plugin.go	69.50% <91.30%> (+0.43%)	:arrow_up:
beanstalk/beanstalkjobs/item.go	73.97% <0.00%> (-2.74%)	:arrow_down:
amqp/amqpjobs/item.go	73.28% <0.00%> (-1.37%)	:arrow_down:

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