Try a different autoassign action (#2093)

This removes the separate data files, which have been failing to load properly ([example](https://github.com/carbon-language/carbon-lang/runs/7957047892?check_suite_focus=true)). This one wasn't working previously, but hopefully will with these changes (and it might've also just been a pull_request_target issue, but the silent "Resource not accessible by integration" failures aren't great).

.github/assign_prs/explorer.yaml

@@ -1,20 +0,0 @@
-# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
-# Exceptions. See /LICENSE for license information.
-# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-
-# Set to true to add reviewers to pull requests
-addReviewers: true
-
-# Set to true to add assignees to pull requests
-addAssignees: false
-
-# A list of reviewers to be added to pull requests (GitHub user name)
-reviewers:
-  - geoffromer
-  - jonmeow
-  - jsiek
-  - zygoloid
-
-# A number of reviewers added to the pull request
-# Set 0 to add all the reviewers (default: 0)
-numberOfReviewers: 1

.github/assign_prs/fallback.yaml

@@ -1,20 +0,0 @@
-# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
-# Exceptions. See /LICENSE for license information.
-# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-
-# Set to true to add reviewers to pull requests
-addReviewers: true
-
-# Set to true to add assignees to pull requests
-addAssignees: false
-
-# A list of reviewers to be added to pull requests (GitHub user name)
-reviewers:
-  - chandlerc
-  - jonmeow
-  - josh11b
-  - zygoloid
-
-# A number of reviewers added to the pull request
-# Set 0 to add all the reviewers (default: 0)
-numberOfReviewers: 1

.github/assign_prs/leads.yaml

@@ -1,19 +0,0 @@
-# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
-# Exceptions. See /LICENSE for license information.
-# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-
-# Set to true to add reviewers to pull requests
-addReviewers: true
-
-# Set to true to add assignees to pull requests
-addAssignees: false
-
-# A list of reviewers to be added to pull requests (GitHub user name)
-reviewers:
-  - KateGregory
-  - chandlerc
-  - zygoloid
-
-# A number of reviewers added to the pull request
-# Set 0 to add all the reviewers (default: 0)
-numberOfReviewers: 1

.github/assign_prs/toolchain.yaml

@@ -1,19 +0,0 @@
-# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
-# Exceptions. See /LICENSE for license information.
-# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-
-# Set to true to add reviewers to pull requests
-addReviewers: true
-
-# Set to true to add assignees to pull requests
-addAssignees: false
-
-# A list of reviewers to be added to pull requests (GitHub user name)
-reviewers:
-  - chandlerc
-  - jonmeow
-  - zygoloid
-
-# A number of reviewers added to the pull request
-# Set 0 to add all the reviewers (default: 0)
-numberOfReviewers: 1

.github/workflows/assign_prs.yaml

@@ -4,7 +4,7 @@
 
 name: 'Auto Assign'
 on:
-  pull_request:
+  pull_request_target:
     types: [opened, ready_for_review]
 
 jobs:
@@ -30,60 +30,31 @@ jobs:
 
       - id: assign-leads
         if: steps.changes.outputs.leads == 'true'
-        uses: kentaro-m/auto-assign-action@v1.2.1
+        uses: hkusu/review-assign-action@v1.3.0
         with:
-          configuration-path: '.github/assign_prs/leads.yaml'
+          reviewers: KateGregory, chandlerc, zygoloid
+          max-num-of-reviewers: 1
 
       - id: assign-explorer
         if: steps.changes.outputs.explorer == 'true'
-        uses: kentaro-m/auto-assign-action@v1.2.1
+        uses: hkusu/review-assign-action@v1.3.0
         with:
-          configuration-path: '.github/assign_prs/explorer.yaml'
+          reviewers: geoffromer, jonmeow, jsiek, zygoloid
+          max-num-of-reviewers: 1
 
       - id: assign-toolchain
         if: steps.changes.outputs.toolchain == 'true'
-        uses: kentaro-m/auto-assign-action@v1.2.1
+        uses: hkusu/review-assign-action@v1.3.0
         with:
-          configuration-path: '.github/assign_prs/toolchain.yaml'
+          reviewers: chandlerc, jonmeow, zygoloid
+          max-num-of-reviewers: 1
 
       - id: assign-fallback
         if:
           steps.changes.outputs.leads != 'true' &&
           steps.changes.outputs.explorer != 'true' &&
           steps.changes.outputs.toolchain != 'true'
-        uses: kentaro-m/auto-assign-action@v1.2.1
+        uses: hkusu/review-assign-action@v1.3.0
         with:
-          configuration-path: '.github/assign_prs/fallback.yaml'
-# TODO: Consider the below. While private it currently fails more sharply, but
-# may be a better post-public choice.
-#
-#      - id: assign-leads
-#        if: steps.changes.outputs.leads == 'true'
-#        uses: hkusu/review-assign-action@v1.3.0
-#        with:
-#          reviewers: KateGregory, chandlerc, zygoloid
-#          max-num-of-reviewers: 1
-#
-#      - id: assign-explorer
-#        if: steps.changes.outputs.explorer == 'true'
-#        uses: hkusu/review-assign-action@v1.3.0
-#        with:
-#          reviewers: geoffromer, jonmeow, jsiek, zygoloid
-#          max-num-of-reviewers: 1
-#
-#      - id: assign-toolchain
-#        if: steps.changes.outputs.toolchain == 'true'
-#        uses: hkusu/review-assign-action@v1.3.0
-#        with:
-#          reviewers: chandlerc, jonmeow, zygoloid
-#          max-num-of-reviewers: 1
-#
-#      - id: assign-fallback
-#        if:
-#          steps.changes.outputs.leads != 'true' &&
-#          steps.changes.outputs.explorer != 'true' &&
-#          steps.changes.outputs.toolchain != 'true'
-#        uses: hkusu/review-assign-action@v1.3.0
-#        with:
-#          reviewers: chandlerc, jonmeow, josh11b, zygoloid
-#          max-num-of-reviewers: 1
+          reviewers: chandlerc, jonmeow, josh11b, zygoloid
+          max-num-of-reviewers: 1

docs/project/code_review.md

@@ -82,10 +82,8 @@ In Carbon, developers will focus on particular areas, loosely broken down as:
 
 -   [Implementation team](groups.md#implementation-team): general changes.
 
-    -   We split out auto-assignment by
-        [explorer](/.github/assign_prs/explorer.yaml),
-        [toolchain](/.github/assign_prs/toolchain.yaml), and
-        [other files, including documentation](/.github/assign_prs/fallback.yaml).
+    -   We split out auto-assignment by explorer, toolchain, and other files
+        (including documentation).
 
 [Auto-assignment](/.github/workflows/assign_prs.yaml) will help find owners, but
 won't always be perfect -- developers may take a PR they weren't auto-assigned