v0.66.0

This release contains a mix of features, performance improvements, and bugfixes.

Improved Test Reports (#2546)

The opa test command now includes a new --var-values flag that enriches reporting of failed tests with the values and locations for variables in the failing expression.
E.g.:

FAILURES
--------------------------------------------------------------------------------
data.test.test_my_policy: FAIL (0ms)

  test.rego:8:
    	x == y + z
    	|    |   |
    	|    |   3
    	|    y + z: 5
    	|    y: 2
    	1

SUMMARY
--------------------------------------------------------------------------------
test.rego:
data.test.test_foo: FAIL (0ms)
--------------------------------------------------------------------------------
FAIL: 1/1

Authored by @johanfylling, reported by @grosser.

Reading stdin in opa exec (#6538)

The opa exec command now supports reading input documents from stdin with the --stdin-input (-I) flag.
E.g.:

$ echo '{"user": "alice"}' | opa exec --stdin-input --bundle my_bundle

Authored by @colinjlacy, reported by @humbertoc-silva.

Topdown and Rego

• ast: Fix blanket "unexpected assign token" error message / usability issue (#6563) authored by @anderseknert
• ast: Fix wrong location on metadata parse errors on first line (#6587) authored by @anderseknert
• ast: Fix/inspect unknowns in with stmt (#6812) authored by @johanfylling reported by @surajupadhyay01
• ast: Include original text in annotation location text attribute (#6779) authored by @anderseknert
• ast: Expanding nested expressions in every domain (#6790) authored by @johanfylling reported by @anakrish
• topdown: Add http.send request attribute to ignore headers for caching key (#6642) authored and reported by @rudrakhp

Runtime, Tooling, SDK

• build: Use chainguard images from dockerhub (#6830) authored by @srenatus
• bundle: Preallocate buffers for file contents. (#6818) authored by @philipaconrad
• plugins: Reduce locks during decision logging (#6797) authored by @mjungsbluth
• plugins/rest: Do local map modification in OAuth2 client credentials flow (#6769) authored and reported by @eubaranov
• loader: Use a better error message when trying to merge non-objects (#6803) authored by @anderseknert
• server/authorizer: Fix gzip payload handling (#6804) authored by @philipaconrad reported by @nevumx

Docs, Website, Ecosystem

• docs: Remove missing prometheus metric go_memstats_gc_cpu_fraction (#6783) authored by @philipaconrad
• docs: Mention that default functions may not evaluate (#6265) authored by @anderseknert
• docs: Fix spelling and grammar of an HTTP (#6786) authored by @jdbaldry
• docs/website: Add vs code and zed to ecosystem page (#6788) authored by @charlieegan3
• docs/website: Add Flipt to the OPA ecosystem (#6781) authored by @markphelps
• docs/website: Add Flipt blog to their ecosystem page (#6789) authored by @charlieegan3
• docs/website: Revise language SDK content (#6811) authored by @charlieegan3

Miscellaneous

• Dependency updates; notably:
  • build(go): bump golang from 1.22.3 to 1.22.4
  • build(deps): bump github.com/containerd/containerd from 1.7.17 to 1.7.18
  • build(deps): bump golang.org/x/net from 0.25.0 to 0.26.0