[Repo Assist] [Eng] Add NuGet and npm caching to CI workflow

[github-actions]

🤖 This PR was created by Repo Assist, an automated AI assistant.

Summary

Adds package caching to all CI jobs to avoid re-downloading NuGet and npm packages on every run.

Changes

• cache: true added to all actions/setup-dotnet@v5 steps — enables automatic NuGet package caching keyed on the project lock files
• cache: 'npm' added to all actions/setup-node@v5 steps — enables npm cache using package-lock.json

Impact

Affects all CI jobs: verify-linting, restore-project, build-javascript (×2 platforms), build-typescript, build-integration, build-standalone, build-python (×6 matrix), build-rust (×3 matrix), build-dart, build-beam, and analyzers (×4 matrix).

NuGet packages (FCS, FSharp.Core, etc.) are large — caching them should meaningfully reduce per-job setup time after the first run on a given lockfile state.

No risk

These changes only affect the CI setup phase; they do not touch build scripts, source code, or test logic.

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Warning

Protected Files — Push Permission Denied

This was originally intended as a pull request, but the patch modifies protected files. A human must create the pull request manually.

Protected files

• .github/workflows/build.yml

The push was rejected because GitHub Actions does not have workflows permission to push these changes, and is never allowed to make such changes, or other authorization being used does not have this permission.

Create the pull request manually

# Download the patch from the workflow run
gh run download 23980596722 -n agent -D /tmp/agent-23980596722

# Create a new branch
git checkout -b repo-assist/eng-ci-caching-2026-04-2eb20ff86d846c03 main

# Apply the patch (--3way handles cross-repo patches)
git am --3way /tmp/agent-23980596722/aw-repo-assist-eng-ci-caching-2026-04.patch

# Push the branch and create the pull request
git push origin repo-assist/eng-ci-caching-2026-04-2eb20ff86d846c03
gh pr create --title '[Repo Assist] [Eng] Add NuGet and npm caching to CI workflow' --base main --head repo-assist/eng-ci-caching-2026-04-2eb20ff86d846c03 --repo fable-compiler/Fable

Note

🔒 Integrity filter blocked 84 items

The following items were blocked because they don't meet the GitHub integrity level.

• Error doesn't show .fs line number #2052 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Compile Error when referencing another project with EntryPoint #2366 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• simulate this Test Local Machine Timezone to fix this  #2375 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• StackOverflow with Fable but not with fsc in release #2392 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Inconsistencies with DateTime string formatting #2408 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Recursive trait calls not working #2473 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• sorting a Resizearray differs from .NET #2506 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• struct anonymous record member access gets compiled weirdly #2512 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Return type overloading not supported by op_Implicit. #2564 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• float32 arithmetics #2652 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Double-to-string format using "G17" does not match .NET #2654 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• DateTimeOffset is handled unexpectedly in frontend #2665 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• ReflectedDecoratorAttribute gives mangled name in MethodInfo #2723 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• AttachMembers doesn't work with inline #2824 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• AttachMembers doesn't work with operators #2825 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Custom operator not used or resolved for erased type... sometimes. #2915 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• ... and 68 more items

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

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