feat: Add `signstar-common` crate to provide common facilities

• Adds all public data required for the signstar-configure-build crate, as it will be shared by other crates.
• Adds NetHSM specific defaults.
• Adds basic configuration file retrieval and directory handling for Signstar hosts.
• Adds administrative credentials file retrieval and directory handling for Signstar hosts.

Signed-off-by: David Runge dvzrv@archlinux.org

changed milestone to %Virtual Test System

added SignstarOS effortmedium priority2-high scopefeature labels

requested review from @wiktor

assigned to @dvzrv

Looks good, a couple of smaller points.

added 5 commits

• a34f5c0e...2cd4b4e5 - 3 commits from branch feat/nethsm-config-extensions
• cc5d1ad9 - feat: Add `signstar-core` crate to provide common facilities
• 48e7bd2e - feat: Rely on `signstar-core` crate for default locations

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deleted the feat/nethsm-config-extensions branch. This merge request now targets the main branch

added 6 commits

• 48e7bd2e...8aa10044 - 4 commits from branch main
• 6fa27992 - feat: Add `signstar-core` crate to provide common facilities
• ce6061f2 - feat: Rely on `signstar-core` crate for default locations

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added 2 commits

• 17308b88 - feat: Add `signstar-core` crate to provide common facilities
• f499c539 - feat: Rely on `signstar-core` crate for default locations

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added 2 commits

• bc390bf4 - feat: Add `signstar-core` crate to provide common facilities
• 97bfb057 - feat: Rely on `signstar-core` crate for default locations

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added 3 commits

• d8a6e16c - 1 commit from branch main
• 8d6b8c19 - feat: Add `signstar-core` crate to provide common facilities
• 49c870c4 - feat: Rely on `signstar-core` crate for default locations

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resolved all threads

requested review from @wiktor