Add infra for github actions (#802)

- Infrastructure to format, lint, and test GitHub Actions
- Mostly copied from azure-rest-api-specs repo

Author: mikeharder

.gitattributes

@@ -1,63 +1,4 @@
-###############################################################################
-# Set default behavior to automatically normalize line endings.
-###############################################################################
-* text=auto
+# Copied from https://github.com/Azure/azure-rest-api-specs/blob/main/.gitattributes
 
-###############################################################################
-# Set default behavior for command prompt diff.
-#
-# This is need for earlier builds of msysgit that does not have it on by
-# default for csharp files.
-# Note: This is only used by command line
-###############################################################################
-#*.cs     diff=csharp
-
-###############################################################################
-# Set the merge driver for project and solution files
-#
-# Merging from the command prompt will add diff markers to the files if there
-# are conflicts (Merging from VS is not affected by the settings below, in VS
-# the diff markers are never inserted). Diff markers may cause the following 
-# file extensions to fail to load in VS. An alternative would be to treat
-# these files as binary and thus will always conflict and require user
-# intervention with every merge. To do so, just uncomment the entries below
-###############################################################################
-#*.sln       merge=binary
-#*.csproj    merge=binary
-#*.vbproj    merge=binary
-#*.vcxproj   merge=binary
-#*.vcproj    merge=binary
-#*.dbproj    merge=binary
-#*.fsproj    merge=binary
-#*.lsproj    merge=binary
-#*.wixproj   merge=binary
-#*.modelproj merge=binary
-#*.sqlproj   merge=binary
-#*.wwaproj   merge=binary
-
-###############################################################################
-# behavior for image files
-#
-# image files are treated as binary by default.
-###############################################################################
-#*.jpg   binary
-#*.png   binary
-#*.gif   binary
-
-###############################################################################
-# diff behavior for common document formats
-# 
-# Convert binary document formats to text before diffing them. This feature
-# is only available from the command line. Turn it on by uncommenting the 
-# entries below.
-###############################################################################
-#*.doc   diff=astextplain
-#*.DOC   diff=astextplain
-#*.docx  diff=astextplain
-#*.DOCX  diff=astextplain
-#*.dot   diff=astextplain
-#*.DOT   diff=astextplain
-#*.pdf   diff=astextplain
-#*.PDF   diff=astextplain
-#*.rtf   diff=astextplain
-#*.RTF   diff=astextplain
+# Use unix line endings always, even on Windows
+* text=auto eol=lf

.github/.gitignore

@@ -0,0 +1,2 @@
+# TypeScript cache
+*.tsbuildinfo

.github/.prettierignore

@@ -0,0 +1,7 @@
+# Includes subset of https://github.com/Azure/azure-rest-api-specs/blob/main/.github/.prettierignore
+
+# code coverage
+coverage
+
+# unmanaged files and folders
+ISSUE_TEMPLATE

.github/.prettierrc.yaml

@@ -0,0 +1,15 @@
+# Copied from https://github.com/Azure/azure-rest-api-specs/blob/main/.github/.prettierrc.yaml
+
+plugins:
+  - prettier-plugin-organize-imports
+
+# Aligned with microsoft/typespec
+printWidth: 100
+
+overrides:
+  # tsconfig.json is actually parsed as JSONC
+  - files:
+      - tsconfig.json
+      - tsconfig.*.json
+    options:
+      parser: jsonc

.github/eslint.config.js

@@ -0,0 +1,11 @@
+// Copied from https://github.com/Azure/azure-rest-api-specs/blob/main/.github/eslint.config.js
+
+import eslint from "@eslint/js";
+import { defineConfig } from "eslint/config";
+import globals from "globals";
+import tseslint from "typescript-eslint";
+
+/** @type {import('eslint').Linter.Config[]} */
+export default defineConfig(eslint.configs.recommended, tseslint.configs.recommended, {
+  languageOptions: { globals: globals.node },
+});

.github/matchers/actionlint.json

@@ -0,0 +1,17 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "actionlint",
+      "pattern": [
+        {
+          "regexp": "^(?:\\x1b\\[\\d+m)?(.+?)(?:\\x1b\\[\\d+m)*:(?:\\x1b\\[\\d+m)*(\\d+)(?:\\x1b\\[\\d+m)*:(?:\\x1b\\[\\d+m)*(\\d+)(?:\\x1b\\[\\d+m)*: (?:\\x1b\\[\\d+m)*(.+?)(?:\\x1b\\[\\d+m)* \\[(.+?)\\]$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4,
+          "code": 5
+        }
+      ]
+    }
+  ]
+}