Add a note on release-for-release matching with core Gramine

[dimakuv]

Additionally, update the notes on OS distros and Gramine versions for GCC and Scikit-learn.

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This change is 

[mkow]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion, not enough approvals from maintainers (2 more required), not enough approvals from different teams (1 more required, approved so far: Intel) (waiting on @dimakuv)

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README.rst line 31 at r1 (raw file):

template, we recommend to remove the comments from your copies as they only add
noise (see e.g. `Memcached
<https://github.com/gramineproject/gramine/tree/master/CI-Examples/memcached>`__

I think this should be a relative URL? Otherwise it will always teleport to master.

[dimakuv]

Reviewable status: all files reviewed, 1 unresolved discussion, not enough approvals from maintainers (2 more required), not enough approvals from different teams (1 more required, approved so far: Intel) (waiting on @mkow)

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README.rst line 31 at r1 (raw file):

Previously, mkow (Michał Kowalczyk) wrote…

I think this should be a relative URL? Otherwise it will always teleport to master.

Relative to what? We link from the examples repo to the gramine repo. So if you meant that, I don't think this is allowed in GitHub's RST?

[mkow]

Reviewable status: all files reviewed, all discussions resolved, not enough approvals from maintainers (1 more required)

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README.rst line 31 at r1 (raw file):

Previously, dimakuv (Dmitrii Kuvaiskii) wrote…

Relative to what? We link from the examples repo to the gramine repo. So if you meant that, I don't think this is allowed in GitHub's RST?

Ah, I missed that it changes the repo.

[dimakuv]

Reviewable status: all files reviewed, 1 unresolved discussion, not enough approvals from maintainers (1 more required)

a discussion (no related file):
Blocking comment to first discuss it with all stakeholders (during Tuesday and Wednesday meetings)

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[kailun-qin]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion

[woju]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dimakuv)

[dimakuv]

During the Gramine Tuesday meeting, it was decided to keep the current Examples policy as-is, and postpone merging breaking changes such as #99 until after the next Gramine release is done.