[CI] issue: HPCINFRA-1736 improve DEB build time

[ntsemah]

Description

What

Add parallel compilation flag (-j) to DEB builds to improve compile time.

Why ?

HPCINFRA-1736

How ?

It is optional but for complex PRs please provide information about the design,
architecture, approach, etc.

Change type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

Check list

• Code follows the style de facto guidelines of this project
• Comments have been inserted in hard to understand places
• Documentation has been updated (if necessary)
• Test has been added (if possible)

[greptile-apps]

Greptile Summary

• Adds parallel compilation (-j8) to DEB builds by passing make_opt environment variable through the build chain
• Changes flow through rpm.sh → build_pkg.sh → dpkg-buildpackage → debian/rules where make_opt is used in both debug and production builds
• Includes minor whitespace cleanup (trailing whitespace and tabs)

Confidence Score: 5/5

• This PR is safe to merge with no functional risks
• The changes correctly implement parallel builds for DEB packages by properly threading the make_opt variable through the build system. The implementation mirrors the existing RPM parallel build pattern (RPM_BUILD_NCPUS) and is well-contained to the build infrastructure with no impact on runtime code
• No files require special attention

Sequence Diagram

sequenceDiagram
    participant CI as "CI System"
    participant globals as "globals.sh"
    participant rpm as "rpm.sh"
    participant build_pkg as "build_pkg.sh"
    participant dpkg as "dpkg-buildpackage"
    participant rules as "debian/rules"
    participant make as "make"
    
    CI->>globals: "source globals.sh"
    globals-->>CI: "make_opt=-j8"
    CI->>rpm: "execute rpm.sh"
    rpm->>build_pkg: "env make_opt=${make_opt} build_pkg.sh"
    build_pkg->>dpkg: "env make_opt=${make_opt} dpkg-buildpackage"
    dpkg->>rules: "invoke debian/rules with make_opt env var"
    rules->>make: "make ${make_opt} (debug build)"
    rules->>make: "dh_auto_build -- ${make_opt} (production build)"
    make-->>rules: "parallel compilation complete"
    rules-->>dpkg: "build complete"
    dpkg-->>build_pkg: "packages created"
    build_pkg-->>rpm: "success"
    rpm-->>CI: "DEB build complete"

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[greptile-apps]

Additional Comments (1)

1. debian/rules, line 9-13 (link)

   logic: The main build: target doesn't include a make command, so the parallel compilation flag ${make_opt} won't be used here. After configuration, debhelper's dh_auto_build will run make, but it won't see ${make_opt}. Consider adding override_dh_auto_build to use the parallel flag:

   override_dh_auto_build:
   	$(MAKE) ${make_opt}
   

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[greptile-apps]

Additional Comments (1)

1. debian/rules, line 9-13 (link)

   logic: parallel compilation flag missing from production build. The ${make_opt} is only applied to the debug build on line 19, but the production build (after this configure step) will be executed by debhelper's automatic dh_auto_build without parallel flags. need to override dh_auto_build to pass ${make_opt} there too

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[dpressle]

check if this package can be built without having this variable like it will in UBS