fix: Installing Superset Locally Using Docker Compose

[mephinet]

you need to cd into the git workdir first, only then can you switch the branch...

[codecov-io]

Codecov Report

Merging #12579 (3a7e35d) into master (0f243c6) will decrease coverage by 3.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12579      +/-   ##
==========================================
- Coverage   66.75%   63.66%   -3.09%     
==========================================
  Files        1015      486     -529     
  Lines       49634    29966   -19668     
  Branches     4839        0    -4839     
==========================================
- Hits        33131    19079   -14052     
+ Misses      16380    10887    -5493     
+ Partials      123        0     -123     

Flag	Coverage Δ
cypress	?
javascript	?
python	63.66% <ø> (-0.30%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/sql_validators/postgres.py	50.00% <0.00%> (-50.00%)	⬇️
superset/db_engine_specs/sqlite.py	65.62% <0.00%> (-9.38%)	⬇️
superset/databases/commands/create.py	83.67% <0.00%> (-8.17%)	⬇️
superset/databases/commands/update.py	85.71% <0.00%> (-8.17%)	⬇️
superset/databases/commands/test_connection.py	84.78% <0.00%> (-4.35%)	⬇️
superset/utils/celery.py	96.42% <0.00%> (-3.58%)	⬇️
superset/models/core.py	85.86% <0.00%> (-2.99%)	⬇️
superset/views/core.py	72.89% <0.00%> (-2.48%)	⬇️
superset/db_engine_specs/mysql.py	89.79% <0.00%> (-2.05%)	⬇️
superset/datasets/api.py	89.49% <0.00%> (-1.83%)	⬇️
... and 537 more

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[srinify]

Thanks @mephinet for this contribution, good call