fix: preserve host ownership for learn-card-app docker dev

[Computer8004]

Summary

• run the learn-card-app app and watcher containers as the host uid/gid so package builds stop landing as root-owned files
• route Docker compose launches through LOCAL_UID / LOCAL_GID in the learn-card-app dev scripts
• make the image's internal Nx cache + run-command build output writable for that non-root runtime and replace the watcher cache volume with tmpfs mounts

Root cause

apps/learn-card-app/compose-local.yaml bind-mounts ../../packages into containers that were running as root. When Nx rebuilt workspace packages from Docker, it wrote dist outputs back to the host as root, which then broke local non-Docker builds.

Validation

• LOCAL_UID=$(id -u) LOCAL_GID=$(id -g) docker compose -f compose-local.yaml run --rm --no-deps watcher id
• LOCAL_UID=$(id -u) LOCAL_GID=$(id -g) docker compose -f compose-local.yaml run --rm --no-deps app id
• LOCAL_UID=$(id -u) LOCAL_GID=$(id -g) docker compose -f compose-local.yaml run --rm --no-deps watcher pnpm exec nx show projects
• LOCAL_UID=$(id -u) LOCAL_GID=$(id -g) docker compose -f compose-local.yaml run --rm --no-deps watcher pnpm exec nx run helpers:build
• stat -c '%u:%g %n' packages/learn-card-helpers/dist

Related: TAY-193 / LC-1725

✨ PR Description

Purpose: Fix file ownership and permission issues in Docker development environment to prevent root-owned files on host system when running learn-card-app containers.

Main changes:

• Configure containers to run as host user by setting LOCAL_UID/LOCAL_GID environment variables in user field
• Replace persistent nx-cache volume with tmpfs mounts for cache directories to avoid permission conflicts
• Add directory creation and permission setup in Dockerfile for cache and executor paths

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✨ PR Review

LGTM

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🥷 Code experts: TaylorBeeston

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Dockerfile.monorepo

Activity based on git-commit:

	TaylorBeeston
MAR
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JAN	103 additions & 0 deletions
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Knowledge based on git-blame:
TaylorBeeston: 94%

apps/learn-card-app/compose-local.yaml

Activity based on git-commit:

	TaylorBeeston
MAR	1 additions & 1 deletions
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JAN	297 additions & 233 deletions
DEC	2 additions & 2 deletions
NOV	247 additions & 0 deletions
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Knowledge based on git-blame:
TaylorBeeston: 76%

apps/learn-card-app/package.json

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DEC	10 additions & 3 deletions
NOV	165 additions & 2 deletions
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