Allow deployments to be triggered by workflow_dispatch events (#8)

This change fixes detection of which branch/commit to use when using (manually triggered) `workflow_dispatch` events to run deployment workflows.

See #7 for the description of the problem that existed previously.

Author: mkarnicki

dist/index.js

@@ -191,7 +191,7 @@ exports.createDeployment = async function(applicationName, fullRepositoryName, b
     const fullRepositoryName = payload.repository.full_name; // like "Codertocat/Hello-World"
 
     const isPullRequest = payload.pull_request !== undefined;
-    const commitId = isPullRequest ? payload.pull_request.head.sha : payload.head_commit.id; // like "ec26c3e57ca3a959ca5aad62de7213c562f8c821"
+    const commitId = isPullRequest ? payload.pull_request.head.sha : (payload.head_commit ? payload.head_commit.id : github.context.sha); // like "ec26c3e57ca3a959ca5aad62de7213c562f8c821"
     const branchName = isPullRequest ? payload.pull_request.head.ref : payload.ref.replace(/^refs\/heads\//, ''); // like "my/branch_name"
 
     const skipSequenceCheck = core.getBooleanInput('skip-sequence-check');

index.js

@@ -10,7 +10,7 @@
     const fullRepositoryName = payload.repository.full_name; // like "Codertocat/Hello-World"
 
     const isPullRequest = payload.pull_request !== undefined;
-    const commitId = isPullRequest ? payload.pull_request.head.sha : payload.head_commit.id; // like "ec26c3e57ca3a959ca5aad62de7213c562f8c821"
+    const commitId = isPullRequest ? payload.pull_request.head.sha : (payload.head_commit ? payload.head_commit.id : github.context.sha); // like "ec26c3e57ca3a959ca5aad62de7213c562f8c821"
     const branchName = isPullRequest ? payload.pull_request.head.ref : payload.ref.replace(/^refs\/heads\//, ''); // like "my/branch_name"
 
     const skipSequenceCheck = core.getBooleanInput('skip-sequence-check');