Add dcx shortcut for docker compose exec with HTTP proxy env vars

[Copilot]

Adds a reusable dcx variable for docker compose exec with HTTP proxy environment variables, eliminating the need to repeat this verbose command pattern:

$dc exec -e "HTTP_PROXY=${HTTP_PROXY:-}" -e "HTTPS_PROXY=${HTTPS_PROXY:-}" -e "NO_PROXY=${NO_PROXY:-}" -e "http_proxy=${http_proxy:-}" -e "https_proxy=${https_proxy:-}" -e "no_proxy=${no_proxy:-}"

Changes:

• Added exec_proxy_args variable in install/dc-detect-version.sh to define the -e flags for proxy environment variables (following the same DRY pattern as proxy_args)
• Added dcx variable alongside existing dc, dcr, dcb shortcuts that uses $exec_proxy_args
• Updated install/bootstrap-s3-nodestore.sh to use $dcx
• Updated install/bootstrap-s3-profiles.sh to use $dcx

Usage:

# Before
$dc exec -e "HTTP_PROXY=${HTTP_PROXY:-}" ... seaweedfs apk add --no-cache s3cmd

# After
$dcx seaweedfs apk add --no-cache s3cmd

Refs #4060 (comment)

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

• Fixes Create a bash shortcut for docker compose exec with http proxy #4066

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create a bash shortcut for docker compose exec with http proxy</issue_title>
<issue_description>Feel free to pick up this issue, since it's easy.

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@aldy505 we should have a shortcut for this monstrosity:

$dc exec -e "HTTP_PROXY=${HTTP_PROXY:-}" -e "HTTPS_PROXY=${HTTPS_PROXY:-}" -e "NO_PROXY=${NO_PROXY:-}" -e "http_proxy=${http_proxy:-}" -e "https_proxy=${https_proxy:-}" -e "no_proxy=${no_proxy:-}" 

Originally posted by @BYK in #4060 (comment)
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create a bash shortcut for docker compose exec with http proxy #4066

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[BYK]

Suggested change

	dcep="$dc exec -e \"HTTP_PROXY=${HTTP_PROXY:-}\" -e \"HTTPS_PROXY=${HTTPS_PROXY:-}\" -e \"NO_PROXY=${NO_PROXY:-}\" -e \"http_proxy=${http_proxy:-}\" -e \"https_proxy=${https_proxy:-}\" -e \"no_proxy=${no_proxy:-}\""
	dcx="$dc exec -e \"HTTP_PROXY=${HTTP_PROXY:-}\" -e \"HTTPS_PROXY=${HTTPS_PROXY:-}\" -e \"NO_PROXY=${NO_PROXY:-}\" -e \"http_proxy=${http_proxy:-}\" -e \"https_proxy=${https_proxy:-}\" -e \"no_proxy=${no_proxy:-}\""

Let's rename this to dcx (short for docker compose exec) and find all relevant occurances in the codebase and replace them with dcx (not just in install/bootstrap-s3-nodestore.sh)

[Copilot]

Renamed to dcx in commit 5375e5b. I've searched the codebase and the only occurrence of the proxy pattern in exec was in bootstrap-s3-nodestore.sh, which is now updated to use $dcx.

[aldy505]

Copilot stating the legal boilerplate is wild.

[BYK]

Use $proxy_args_dc defined above for the proxy arguments. Do not write them yourself. See the example on line 61

[Copilot]

Added exec_proxy_args variable (similar to proxy_args) and updated dcx to use $exec_proxy_args instead of inline proxy flags. This follows the same DRY pattern as proxy_args/proxy_args_dc. Commit 49ca442.

[BYK]

@aldy505 I think this is good enough

[aldy505]

@copilot You may rebase from master, you have conflicts

[Copilot]

@copilot You may rebase from master, you have conflicts

I'm unable to rebase or resolve merge conflicts directly as I don't have access to force push. Could you please rebase this branch from master to resolve the conflicts?

[aldy505]

@copilot You need to use the $dcx shortcut on the install/bootstrap-s3-profiles.sh file too!

[Copilot]

@copilot You need to use the $dcx shortcut on the install/bootstrap-s3-profiles.sh file too!

Updated install/bootstrap-s3-profiles.sh to use $dcx in both places where the verbose proxy pattern was used. Commit dc1a28f.

[aldy505]

Good enough