Set up valtools subtree and move to GitHub Actions

[kyleam]

This series wires up pkgr to produce external scores for mpn.scorecard. Much of the work is done by the new internal/valtools/ subtree, which has shared tooling that will also be used by bbi. To set that up on pkgr's side, we need to

• define a traceability matrix

• add a command to generate markdown pages for the CLI

• add scripts for running the tests

internal/valtools/README.md has more details.

With these changes, mpn.scorecard input can be generated by running make vt-all from the top-level directory.

The goal of this PR is to get all the setup in place that we need for generating the scores, leaving additional changes and cleanup for we want for the scorecard (e.g., fleshing out documentation and adding missing tests) to followup PRs.

GitHub Actions

The goal of this PR was not to switch to GitHub Actions. Unfortunately, something about the dependency updates triggers what looks to be a Go 1.16 bug (see actions commit message for a few more details). Given the plan to switch to GitHub Actions soon, I'd rather do that now than put effort into updating the images for Drone.

Overview

Here's an overview of the commits in the first-parent line.

[01] rcmd/configure_test.go: prevent tempdir check from skipping
[02] integration_tests/baseline: delete root_test.go
[03] integration_tests/mixed-source: drop skip for inactive test
[04] integration_tests/library: fix skip message typo
[05] integration_tests/library: shorten a subtest name
[06] integration_tests/version: loosen output check

These are various test tweaks (e.g., related to skipping, which make it through to the scorecard).

[07] cmd/pkgr: delete commented code for generating docs
[08] cmd: hide debug and experiment subcommands

These two are prep commits related to generating the command documentation under docs/commands/.

[09] add internal/valtools/ subtree

This is the merge commit that brings in the shared tooling.

[10] go.mod: update for internal/valtools addition
[11] internal/tools: define executable for generating command docs
[12] docs: generate command docs
[13] add script for running unit tests
[14] add script for running integration tests
[15] make: wire up internal/valtools
[16] docs: define a traceability matrix

These are focused on hooking up the internal/valtools/ subtree.

[17] ci: switch to GitHub Actions

---

• wait for base PR to be merged: Miscellaneous test fixes #418

[kyleam]

Same approach as bbi:

This release job hasn't been tested. My thinking is that we can do a prerelease after the validation rework lands, and I can adjust as needed then.

[seth127]

This all looks great. As usual, I appreciate the documentation in the commit messages. The README in the subtree (at internal/valtools/README.md) is also quite helpful.

I found two small typos in that README, but I'm approving this now so that it can be merged through once those are fixed upstream and pulled in. Thanks for all the work on this.

[seth127]

typo s/locatino/location/

[seth127]

typo: s/rule.mk/rules.mk (I think?)

[seth127]

From the PR description:

Given the plan to switch to GitHub Actions soon, I'd rather do that now than put effort into updating the images for Drone.

This makes sense to me.

[kyleam]

I found two small typos in that README,

Thanks. Fixed those (and ran through spell check to find a few more :/)