docs(migration): update Docker base image to Alpine 3.22

[tasso94]

related to camunda/camunda-bpm-platform#5296

[venetrius]

👍

[ap-development-workflow]

Backport failed for 7.21, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin 7.21
git worktree add -d .worktree/7.21-backport-1804 origin/7.21
cd .worktree/7.21-backport-1804
git switch --create 7.21-backport-1804
git cherry-pick -x 18856ebdbc84436c3a7ebfccc5298f2e99ab9c39

[ap-development-workflow]

Backport failed for 7.22, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin 7.22
git worktree add -d .worktree/7.22-backport-1804 origin/7.22
cd .worktree/7.22-backport-1804
git switch --create 7.22-backport-1804
git cherry-pick -x 18856ebdbc84436c3a7ebfccc5298f2e99ab9c39

[ap-development-workflow]

Backport failed for 7.23, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin 7.23
git worktree add -d .worktree/7.23-backport-1804 origin/7.23
cd .worktree/7.23-backport-1804
git switch --create 7.23-backport-1804
git cherry-pick -x 18856ebdbc84436c3a7ebfccc5298f2e99ab9c39