Make "init not called" a configuration error

src/analyze-action.ts

@@ -225,7 +225,7 @@ async function run() {
 
     config = await getConfig(actionsUtil.getTemporaryDirectory(), logger);
     if (config === undefined) {
-      throw new Error(
+      throw new util.ConfigurationError(
         "Config file could not be found at expected location. Has the 'init' action been called?",
       );
     }

src/autobuild-action.ts

@@ -24,6 +24,7 @@ import {
   checkActionVersion,
   checkDiskUsage,
   checkGitHubVersionInRange,
+  ConfigurationError,
   getErrorMessage,
   initializeEnvironment,
   wrapError,
@@ -92,7 +93,7 @@ async function run() {
 
     config = await getConfig(getTemporaryDirectory(), logger);
     if (config === undefined) {
-      throw new Error(
+      throw new ConfigurationError(
         "Config file could not be found at expected location. Has the 'init' action been called?",
       );
     }

src/resolve-environment-action.ts

@@ -22,6 +22,7 @@ import {
   checkDiskUsage,
   checkForTimeout,
   checkGitHubVersionInRange,
+  ConfigurationError,
   getErrorMessage,
   wrapError,
 } from "./util";
@@ -53,7 +54,7 @@ async function run() {
 
     config = await getConfig(getTemporaryDirectory(), logger);
     if (config === undefined) {
-      throw new Error(
+      throw new ConfigurationError(
         "Config file could not be found at expected location. Has the 'init' action been called?",
       );
     }