Fixes #6 Add support for updating releases

src/Releases.ts

@@ -1,6 +1,6 @@
 import { Context } from "@actions/github/lib/context";
 import { GitHub } from "@actions/github";
-import { AnyResponse, Response, ReposCreateReleaseResponse } from "@octokit/rest";
+import { AnyResponse, Response, ReposCreateReleaseResponse, ReposGetReleaseByTagResponse } from "@octokit/rest";
 
 export interface Releases {
     create(
@@ -11,6 +11,17 @@ export interface Releases {
         name?: string
     ): Promise<Response<ReposCreateReleaseResponse>>
 
+    getByTag(tag: string): Promise<Response<ReposGetReleaseByTagResponse>>
+
+    update(
+        id: number,
+        tag: string,
+        body?: string,
+        commitHash?: string,
+        draft?: boolean,
+        name?: string
+    ): Promise<Response<ReposCreateReleaseResponse>>
+
     uploadArtifact(
         assetUrl: string,
         contentLength: number,
@@ -20,7 +31,7 @@ export interface Releases {
     ): Promise<Response<AnyResponse>>
 }
 
-export class GithubReleases implements Releases{
+export class GithubReleases implements Releases {
     context: Context
     git: GitHub
 
@@ -47,6 +58,34 @@ export class GithubReleases implements Releases{
         })
     }
 
+    async getByTag(tag: string): Promise<Response<ReposGetReleaseByTagResponse>> {
+        return this.git.repos.getReleaseByTag({
+            owner: this.context.repo.owner,
+            repo: this.context.repo.repo,
+            tag: tag
+        })
+    }
+
+    async update(
+        id: number,
+        tag: string,
+        body?: string,
+        commitHash?: string,
+        draft?: boolean,
+        name?: string
+    ): Promise<Response<ReposCreateReleaseResponse>> {
+        return this.git.repos.updateRelease({
+            release_id: id,
+            body: body,
+            name: name,
+            draft: draft,
+            owner: this.context.repo.owner,
+            repo: this.context.repo.repo,
+            target_commitish: commitHash,
+            tag_name: tag
+        })
+    }
+
     async uploadArtifact(
         assetUrl: string,
         contentLength: number,