Update GitHub Actions workflows. (#582)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit 19c542b12a65e3f3ec1d8213111262a9887dcda0.

.github/actions/esc-action/action.yaml

@@ -0,0 +1,12 @@
+name: "Load secrets"
+description: |
+  This is a temporary action which assists with our migration to ESC. Instead
+  of surrounding every step that references secrets with an "if ESC" block, we
+  instead modify those steps to consume their secrets from this step's outputs.
+  Then, later, we can replace this action with esc-action to actually load
+  secrets from ESC.
+inputs: {}
+outputs: {}
+runs:
+  using: "node20"
+  main: "index.js"

.github/actions/esc-action/index.js

@@ -0,0 +1,14 @@
+const fs = require("fs");
+
+const file = process.env["GITHUB_OUTPUT"];
+var stream = fs.createWriteStream(file, { flags: "a" });
+
+for (const [name, value] of Object.entries(process.env)) {
+  try {
+    stream.write(`${name}=${value}\n`);
+  } catch (err) {
+    console.log(`error: failed to set output for ${name}: ${err.message}`);
+  }
+}
+
+stream.end();