[DEVEX-1204] Add conditional build flags for app and webserver images

[ronneseth]

Summary

• Adds build_app_image (default true) and build_webserver_image (default true) input flags to php-laravel-build-push.yaml
• Adds if: conditions to build-and-push-app-image and build-and-push-webserver-image jobs, matching the existing build_cli_image pattern
• Fully backward-compatible: existing callers don't pass these inputs, so they default to true (unchanged behavior)

Context

DEVEX-1204

CLI-only repos (like marketplaces) don't have Dockerfile-app or Dockerfile-nginx. The merge-to-main workflow fails with open Dockerfile-app: no such file or directory because the app and webserver jobs always run unconditionally. The CLI job already had a build_cli_image toggle — this PR adds the same pattern for the other two jobs.

Test plan

• Existing repos (e.g., listings) that don't pass the new inputs should build all three images as before (defaults are true)
• CLI-only repos (e.g., marketplaces) can pass build_app_image: false and build_webserver_image: false to skip those jobs
• Verify the skipped jobs show as "skipped" in the Actions UI (not failed)

Made with Cursor

[cursor]

PR Summary

Low Risk
Low risk: only adds optional workflow_call inputs and gates two GitHub Actions jobs behind if: conditions, with defaults preserving current behavior. Main risk is callers misconfiguring flags and unintentionally skipping required image builds.

Overview
Adds new workflow_call inputs build_app_image and build_webserver_image (both default true) to the reusable php-laravel-build-push.yaml workflow.

Updates the build-and-push-app-image and build-and-push-webserver-image jobs to run conditionally via if: ${{ inputs.build_app_image }} / if: ${{ inputs.build_webserver_image }}, allowing repos to skip building images when corresponding Dockerfiles don’t exist while keeping existing behavior by default.

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