Tests: Add test for migration with existing container.

[csadorf]

No description provided.

[codecov]

Codecov Report

Merging #104 (c14a3fb) into main (7138164) will decrease coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   86.39%   85.90%   -0.49%     
==========================================
  Files           9        9              
  Lines         823      823              
==========================================
- Hits          711      707       -4     
- Misses        112      116       +4     

Flag	Coverage Δ
py-3.10	?
py-3.7	85.26% <ø> (-0.51%)	⬇️
py-3.8	85.73% <ø> (ø)
py-3.9	85.85% <ø> (ø)

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Impacted Files	Coverage Δ
aiidalab_launch/util.py	80.17% <0.00%> (-3.45%)	⬇️

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