Migrate from deprecated operator_libs_linux to charmlibs

[Copilot]

Applicable spec: N/A

Overview

Migrated from deprecated operator_libs_linux libraries to actively maintained charmlibs packages for apt, systemd, and passwd functionality.

Rationale

The operator_libs_linux libraries are deprecated and no longer receive updates. Charmlibs 1.0 provides bug-for-bug compatible replacements with ongoing maintenance.

Juju Events Changes

None.

Module Changes

src/builder.py: Updated imports from charms.operator_libs_linux.v0.apt and charms.operator_libs_linux.v1.systemd to charmlibs.apt and charmlibs.systemd.

tests/unit/test_builder.py: Updated test imports to use new charmlibs packages.

Library Changes

• Added dependencies: charmlibs-apt~=1.0, charmlibs-systemd~=1.0
• Removed deprecated libraries: lib/charms/operator_libs_linux/v0/{apt.py,passwd.py}, lib/charms/operator_libs_linux/v1/systemd.py (~2400 lines)

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, senior-review-required, documentation)
• The docs/changelog.md is updated with user-relevant changes in the format of keep a changelog v1.1.0
• The application version is incremented in app/pyproject.toml

Unchecked items: Documentation and changelog updates deferred - library migration has no user-facing impact. No application version increment needed as this is a dependency update without functional changes.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upgrade legacy operator_libs_linux libraries</issue_title>
<issue_description>### Enhancement Proposal

Currently the systemd, passwd, and apt libraries are deprecated and replaced by charmlibs. We should migrate to use charmlibs libraries.

Impact

Medium (The feature may be helpful in the future)

Impact Rationale

To keep receiving feature and bug fixes updates.</issue_description>

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

• Fixes Upgrade legacy operator_libs_linux libraries #200

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