Merge pull request #828 from tdurieux/fix/public-repository-app-access

fix: allow GitHub App access to public repositories without installation

src/core/model/repository-access.schema.ts

@@ -3,6 +3,7 @@ import { Schema } from "mongoose";
 export const repositoryAccessSchema = new Schema({
   kind: { type: String, enum: ["oauth", "github-app"], required: true },
   repositoryId: Number,
+  publicRead: Boolean,
   installationId: Number,
   revision: { type: String, required: true },
 }, { _id: false });