Fix shellcommand error on alpine sh shell

[chunleng]

When running on sh on alpine image, the following error occurs:

[test.yml/test] 🚀  Start image=docker:20.10
[test.yml/test]   🐳  docker pull image=docker:20.10 platform=linux/amd64 username= forcePull=false
[test.yml/test]   🐳  docker create image=docker:20.10 platform=linux/amd64 entrypoint=["/usr/bin/tail" "-f" "/dev/null"] cmd=[]
[test.yml/test]   🐳  docker run image=docker:20.10 platform=linux/amd64 entrypoint=["/usr/bin/tail" "-f" "/dev/null"] cmd=[]
[test.yml/test] ⭐ Run Main ls
[test.yml/test]   🐳  docker exec cmd=[sh -e -c /var/run/act/workflow/0.sh] user= workdir=..
| 0.sh: applet not found
[test.yml/test]   ❌  Failure - Main ls
[test.yml/test] exitcode '127': command not found, please refer to https://github.com/nektos/act/issues/107 for more information
[test.yml/test] 🏁  Job failed
Error: Job 'test' failed

It seems to be working without any problem on debian. I suspect that it's due to the difference in interpreting a fille passed onto -c option by both the OS.

Since we are passing in a .sh file in this case, I think it's safe to drop that option

[codecov]

Codecov Report

Merging #1464 (59ac588) into master (4f8da0a) will increase coverage by 2.92%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #1464      +/-   ##
==========================================
+ Coverage   57.50%   60.43%   +2.92%     
==========================================
  Files          32       44      +12     
  Lines        4594     6999    +2405     
==========================================
+ Hits         2642     4230    +1588     
- Misses       1729     2463     +734     
- Partials      223      306      +83     

Impacted Files	Coverage Δ
pkg/common/file.go	0.00% <0.00%> (ø)
pkg/container/docker_logger.go	52.08% <ø> (ø)
pkg/container/host_environment.go	0.00% <0.00%> (ø)
pkg/container/util.go	0.00% <0.00%> (ø)
pkg/model/action.go	0.00% <0.00%> (ø)
pkg/model/step_result.go	0.00% <ø> (ø)
pkg/container/docker_run.go	12.82% <11.53%> (+7.27%)	⬆️
pkg/model/workflow.go	45.65% <23.58%> (-5.26%)	⬇️
...ontainer/linux_container_environment_extensions.go	24.32% <24.32%> (ø)
pkg/container/docker_pull.go	33.33% <33.33%> (ø)
... and 37 more

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[ChristopherHX]

Thank you for this fix,
Weird, why do we even have a -c that's not in the original https://github.com/actions/runner/blob/63640e91fa52af8be040ddaf3b24f3ac24d68fbc/src/Runner.Worker/Handlers/ScriptHandlerHelpers.cs#L19