docker: update base to rockylinux-9.8, golang builder, README

[ploxiln]

• update Dockerfile base to rockylinux-9.8
• update golang builder to golang 1.24.13
• update docker README build instructions, copy from main

backport of #13757 (mostly)

[ploxiln]

Retrying "PR Builder - clang", fail was:

fdbserver -r simulation --crash --logsize 1024MB -f src/foundationdb/tests/restarting/from_7.4.0/SnapTestAttrition-1.toml --buggify on --seed 3974680177
fdbserver -r simulation --crash --logsize 1024MB -f src/foundationdb/tests/restarting/from_7.4.0/SnapTestAttrition-2.toml --buggify off --seed 3974680178

20260803-202057-pr13810-clang-05346ad2-1622-a5ad765d3817a448 compressed=True data_size=41556524 duration=514929 ended=10000 fail=1 fail_fast=10 max_runs=10000 pass=9999 priority=100 remaining=0 runtime=0:11:32 sanity=False started=10000 stopped=20260803-203229 submitted=20260803-202057 timeout=5400 username=pr13810-clang-05346ad2-16229

[gxglass]

AI thinks it sees a bug -

review-13810.md

[ploxiln]

The bump to rockylinux:9.8-minimal does not add the "faulty mirror list" workaround that main relies on. On main, disabling the Rocky mirrorlist (sed ... rocky.repo, switching mirrorlist→baseurl) before microdnf install was introduced precisely at the Rocky 9.6 bump (886c693 / #12463) and is retained at 9.8 (#13757); the team also separately fought flaky mirror behavior in #12457 ("Docker build fails half the time in CI"). release-7.4 never received #12463 (it is still at 9.5 with no mirror handling), and this PR jumps 9.5 → 9.8 without adding it. See Bugs.

I'm not sure if that's still really needed, I haven't seen that error in the various PR and release builds of the release-7.3 and release-7.4 branches, and it doesn't seem like something that would become more needed with rockylinux-9.6 ... but I imagine it might have to do with firewall rules affecting different randomly selected mirrors, so I went ahead and backported that "mirrorlist -> baseurl" swap, and tested by rebuilding the docker images (with the new-ish "container" tool for macOS).

I also backported some comment tweaks, and removed "docker.io/" prefix in FROM lines to be consistent (not needed for our CI/release builds, not needed for "container" tool, needed for "vessel" tool depending on config ...)

[foundationdb-ci]

Result of foundationdb-pr-clang-arm on Linux RHEL 9

• Commit ID: b3549f2
• Duration 0:47:57
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-clang on Linux RHEL 9

• Commit ID: b3549f2
• Duration 0:53:58
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-macos-m1 on macOS 14.x

• Commit ID: b3549f2
• Duration 0:55:54
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr on Linux RHEL 9

• Commit ID: b3549f2
• Duration 0:59:15
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-macos on macOS 14.x

• Commit ID: b3549f2
• Duration 1:17:59
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-cluster-tests on Linux RHEL 9

• Commit ID: b3549f2
• Duration 1:34:24
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)
• Cluster Test Logs zip file of the test logs (available for 30 days)