fixup! Move download Storybook artefact script to separate file

.github/workflows/post_build_and_test.yml

@@ -33,28 +33,12 @@ jobs:
         run: |
           yarn install --frozen-lockfile
 
-      # Based on
-      # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#using-data-from-the-triggering-workflow
       - name: Download pre-built Storybook
         uses: actions/github-script@v6
         with:
           script: |
-            const allArtifacts = await github.rest.actions.listWorkflowRunArtifacts({
-               owner: context.repo.owner,
-               repo: context.repo.repo,
-               run_id: context.payload.workflow_run.id,
-            });
-            const matchArtifact = allArtifacts.data.artifacts.filter((artifact) => {
-              return artifact.name == "storybook-static"
-            })[0];
-            const download = await github.rest.actions.downloadArtifact({
-               owner: context.repo.owner,
-               repo: context.repo.repo,
-               artifact_id: matchArtifact.id,
-               archive_format: 'zip',
-            });
-            const fs = require('fs');
-            fs.writeFileSync(`${process.env.GITHUB_WORKSPACE}/storybook-static.zip`, Buffer.from(download.data));
+            const { downloadStorybookArtifact } = await import('${{ github.workspace }}/scripts/github-actions/downloadStorybookArtifact.mjs')
+            await downloadStorybookArtifact({ github, context })
 
       - name: Unzip pre-built Storybook
         run: |

scripts/github-actions/downloadStorybookArtifact.mjs

@@ -0,0 +1,31 @@
+import fs from 'fs'
+
+/**
+ * Used by .github/workflows/post_build_and_test.yml
+ *
+ * Based on
+ * https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#using-data-from-the-triggering-workflow
+ */
+export const downloadStorybookArtifact = async ({ github, context }) => {
+  const allArtifacts = await github.rest.actions.listWorkflowRunArtifacts({
+    owner: context.repo.owner,
+    repo: context.repo.repo,
+    run_id: context.payload.workflow_run.id,
+  })
+
+  const matchArtifact = allArtifacts.data.artifacts.filter((artifact) => {
+    return artifact.name === 'storybook-static'
+  })[0]
+
+  const download = await github.rest.actions.downloadArtifact({
+    owner: context.repo.owner,
+    repo: context.repo.repo,
+    artifact_id: matchArtifact.id,
+    archive_format: 'zip',
+  })
+
+  fs.writeFileSync(
+    `${process.env.GITHUB_WORKSPACE}/storybook-static.zip`,
+    Buffer.from(download.data)
+  )
+}