[#827] executor/docker: Fix: command arguments are not evaluated

[yohamta]

Issue: #827

• Fix the Docker executor to evaluate commands before execution
• Clean up the code in internal/node.go

[codecov]

Codecov Report

Attention: Patch coverage is 65.68323% with 221 lines in your changes missing coverage. Please review.

Project coverage is 55.73%. Comparing base (36d23aa) to head (6623d9c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/digraph/executor/command.go	0.00%	91 Missing ⚠️
internal/digraph/scheduler/node.go	70.63%	54 Missing and 20 partials ⚠️
internal/digraph/scheduler/data.go	83.40%	33 Missing and 4 partials ⚠️
internal/digraph/executor/docker.go	0.00%	11 Missing ⚠️
internal/digraph/scheduler/scheduler.go	88.13%	6 Missing and 1 partial ⚠️
internal/digraph/scheduler/graph.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #832      +/-   ##
==========================================
- Coverage   55.93%   55.73%   -0.20%     
==========================================
  Files          73       74       +1     
  Lines        7920     8108     +188     
==========================================
+ Hits         4430     4519      +89     
- Misses       3110     3202      +92     
- Partials      380      387       +7     

Files with missing lines	Coverage Δ
internal/digraph/scheduler/graph.go	73.78% <87.50%> (ø)
internal/digraph/scheduler/scheduler.go	83.06% <88.13%> (-2.46%)	⬇️
internal/digraph/executor/docker.go	0.77% <0.00%> (-0.03%)	⬇️
internal/digraph/scheduler/data.go	83.40% <83.40%> (ø)
internal/digraph/scheduler/node.go	67.00% <70.63%> (-2.80%)	⬇️
internal/digraph/executor/command.go	2.32% <0.00%> (-1.90%)	⬇️

... and 1 file with indirect coverage changes

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