add simple quotes around env service flag

[adrianiurca]

No description provided.

[puppet-community-rangefinder]

docker_service_flags is a function

Breaking changes to this file MAY impact these 4 modules (near match):

• mvasilenko-docker
• memoussati-docker
• puppetlabs-docker
• hackerhappyhour-docker

This module is declared in 6 of 576 indexed public Puppetfiles.

---

These results were generated with Rangefinder, a tool that helps predict the downstream impact of breaking changes to elements used in Puppet modules. You can run this on the command line to get a full report.

Exact matches are those that we can positively identify via namespace and the declaring modules' metadata. Non-namespaced items, such as Puppet 3.x functions, will always be reported as near matches only.

[codecov-io]

Codecov Report

Merging #706 (d5d0f67) into main (284a7d3) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #706   +/-   ##
=======================================
  Coverage   23.42%   23.42%           
=======================================
  Files          20       20           
  Lines         760      760           
=======================================
  Hits          178      178           
  Misses        582      582           

Impacted Files	Coverage Δ
...ib/puppet/parser/functions/docker_service_flags.rb	0.00% <0.00%> (ø)

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[kenyon]

s/simple/single/ 😃