docker.Makefile: Use active context socket

[vvoland]

The development and e2e containers hard-code /var/run/docker.sock, so rootless and other local contexts cannot expose their daemon socket. Resolve the active context's Docker endpoint and strip the unix scheme before using it as the bind source.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

Two CONFIRMED medium-severity findings on the new DOCKER_SOCK variable assignment introduced by this PR:

1. Non-unix endpoint passes raw URL as bind-mount source — when the active Docker context uses a TCP, SSH, or named-pipe endpoint, patsubst unix://%,% finds no match and the raw scheme URL is used as src= for --mount type=bind, which Docker will reject.
2. Context inspect failure yields empty DOCKER_SOCK — if docker context inspect fails (missing binary, unknown context, etc.), Make swallows stderr and DOCKER_SOCK becomes empty, producing an opaque "field src must not be empty" error with no indication of the root cause.

Both findings include a suggested fix: wrapping the expression with `` so a safe default is always present.

[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

The PR correctly replaces hardcoded /var/run/docker.sock with a dynamically resolved socket path from the active Docker context. The core logic using patsubst + filter + or fallback is sound for the common unix-socket case. Two edge cases are introduced: non-unix context endpoints (tcp://, ssh://, npipe://) silently fall back to the hardcoded default, and docker context inspect failures are silently swallowed.

[docker-agent]

Assessment: 🟢 APPROVE

The PR correctly resolves the active Docker context's socket path, strips the unix:// scheme, and uses it as the bind-mount source — with a safe fallback to /var/run/docker.sock for non-unix contexts and failure cases. The $(shell ...) / filter / patsubst / or chain is correct Make idiom, Make trims trailing newlines from shell output, and the single-quoting of the --mount argument is valid because Make expands variables before the shell sees the command. All three bind-mount sites are updated consistently.

[thaJeztah]

LGTM

we should have a flag for that 😜