Skip OpenSSL installation — no longer required in latest buildcache

[Copilot]

Since buildcache removed its OpenSSL dependency, the libssl1.1 installation step (including the focal-security repo fallback) is unnecessary overhead.

Changes

• action.yml — Remove apt-get update + libssl1.1 install block (and its focal-security fallback) from the Linux install step
• README.md — Remove reference to automatic OpenSSL dependency installation
• test-basic.sh — Invert the OpenSSL check: assert apt-get libssl is absent rather than present

Original prompt

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This section details on the original issue you should resolve

<issue_title>Skip install of OpenSSL</issue_title>
<issue_description>In the latest release, it is not required to install OpenSSL

See this commit https://gitlab.com/bits-n-bites/buildcache/-/commit/44fb78eb385cd118efd5fbebcba989d5fd4266ec</issue_description>

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

• Fixes Skip install of OpenSSL #2

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[magnesj]

@copilot some tests are failing. Blacklist 31.5 and 31.6 to make all test pass.

[Copilot]

@copilot some tests are failing. Blacklist 31.5 and 31.6 to make all test pass.

Done in aae6daa. Removed v0.31.5 from all three test jobs (test-specific-version, test-multiple-installations, test-url-formats). v0.31.6 was never in the test matrix so no change needed for it. The upgrade scenario now targets v0.31.4 instead of v0.31.5.

Warning

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• gitlab.com
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