Make delete-env work as documented (#101)

I realized after looking at the code that delete-env was deleting an environment, which isn't really related to deployments like the rest of this action (at least not in a way that mirrors deactivate-env like the README says).

I've added code here to do the delete in the way I expected it to work--deactivate all deployments for the given environment, then delete them.

src/lib/deactivate.ts

@@ -41,6 +41,7 @@ async function deactivateEnvironment(
   }
 
   log.info(`${environment}: ${existing} deployments updated`);
+  return deployments;
 }
 
 export default deactivateEnvironment;

src/lib/delete.ts

@@ -0,0 +1,40 @@
+import { GitHub } from "@actions/github/lib/utils";
+
+import { DeploymentContext } from "./context";
+import deactivateEnvironment from "./deactivate";
+
+/**
+ * Delete all deployments within this environment.
+ */
+async function deleteEnvironment(
+  github: InstanceType<typeof GitHub>,
+  context: DeploymentContext
+) {
+  const {
+    log,
+    owner,
+    repo,
+    coreArgs: { environment },
+  } = context;
+  const deployments = await deactivateEnvironment(github, context);
+  if (!deployments) {
+    return;
+  }
+  const existing = deployments.data.length;
+  for (let i = 0; i < existing; i++) {
+    const deployment = deployments.data[i];
+    log.info(
+      `${environment}.${deployment.id}: deleting deployment (${deployment.sha})"`
+    );
+    await github.rest.repos.deleteDeployment({
+      owner,
+      repo,
+      deployment_id: deployment.id,
+    });
+    log.debug(`${environment}.${deployment.id} deleted`);
+  }
+
+  log.info(`${environment}: ${existing} deployments deleted`);
+}
+
+export default deleteEnvironment;

src/steps/index.ts

@@ -3,6 +3,7 @@ import { GitHub } from "@actions/github/lib/utils";
 
 import { DeploymentContext } from "../lib/context";
 import deactivateEnvironment from "../lib/deactivate";
+import deleteEnvironment from "../lib/delete";
 import {
   getBooleanInput,
   getOptionalInput,
@@ -90,11 +91,7 @@ export async function run(
         {
           log.debug(`'${step}' arguments`, { coreArgs });
 
-          await github.rest.repos.deleteAnEnvironment({
-            owner: context.owner,
-            repo: context.repo,
-            environment_name: coreArgs.environment,
-          });
+          await deleteEnvironment(github, context);
         }
         break;