New: adds basic errors

src/Error.js

@@ -0,0 +1,35 @@
+export default class SemanticReleaseHerokuError extends Error {
+    #payload;
+
+    constructor(payload) {
+        super();
+
+        this.name = this.constructor.name;
+        this.#payload = payload;
+
+        Error.captureStackTrace(this, this.constructor);
+    }
+
+    get payload() {
+        return this.#payload;
+    }
+}
+
+export class VERIFICATION_MISSED extends SemanticReleaseHerokuError {
+    message = `verifyConditions should be passed to run step [${this.payload}]`
+}
+
+export class VALIDATION_FAILED extends SemanticReleaseHerokuError {
+    message = JSON.stringify(this.payload)
+}
+
+export class API_ERROR extends SemanticReleaseHerokuError {
+    get message() {
+        const message = this.payload.toString();
+        const inner  = this.payload?.response?.data;
+
+        if (inner) return [ message, JSON.stringify(inner) ].join(' ');
+
+        return message;
+    }
+}