ci: check dirty git tree for jobs

.github/actions/restore-node/action.yml

@@ -181,18 +181,29 @@ runs:
         mkdir -p node_modules/.cache/agoric
         date > node_modules/.cache/agoric/yarn-built
 
-    - name: git dirty check
-      working-directory: ${{ inputs.path }}
-      shell: bash
-      run: |-
-        set -x
-        # Fail if `git status` reports anything other than the following:
-        # * an untracked endo-sha.txt from above
-        # * work tree files that have been staged without further changes
-        #   (e.g., package.json or yarn.lock) as indicated by the Y position
-        #   in "XY PATH" being a space
-        if [ -n "$(git status --porcelain | grep -vE '^[?][?] endo-sha.txt$|^. '; true)" ]; then
-          git status
-          echo "Unexpected dirty git status" 1>&2
-          exit 1
-        fi
+    # Refs: https://github.com/orgs/community/discussions/45342
+    - name: Validate Git Tree in Root Directory
+      if: inputs.path == '.'
+      uses: ./.github/actions/with-post-step
+      with:
+        main: echo "Checking Git tree for changes in the root directory..."
+        post: |
+          set -x
+          if [ -n "$(git status --porcelain | grep -vE '^[?][?] endo-sha.txt$|^. '; true)" ]; then
+            git status
+            echo "Unexpected dirty git status in default path" 1>&2
+            exit 1
+          fi
+
+    - name: Validate Git Tree in Agoric SDK Directory
+      if: inputs.path == './agoric-sdk'
+      uses: ./agoric-sdk/.github/actions/with-post-step
+      with:
+        main: echo "Checking Git tree for changes in the root directory..."
+        post: |
+          set -x
+          if [ -n "$(git status --porcelain | grep -vE '^[?][?] endo-sha.txt$|^. '; true)" ]; then
+            git status
+            echo "Unexpected dirty git status in Agoric SDK path" 1>&2
+            exit 1
+          fi

.github/actions/with-post-step/action.yml

@@ -0,0 +1,21 @@
+name: With Post Step
+
+description: >
+  JavaScript Action to run a main command and a subsequent post command.
+
+inputs:
+  main:
+    description: "Primary command or script to execute."
+    required: true
+  post:
+    description: "Command or script to run after the main command."
+    required: true
+  key:
+    description: "State variable name to identify the post step."
+    required: false
+    default: POST
+
+runs:
+  using: "node20"
+  main: "main.cjs"
+  post: "main.cjs"

.github/actions/with-post-step/main.cjs

@@ -0,0 +1,22 @@
+// Ref: https://github.com/pyTooling/Actions/blob/main/with-post-step/main.js
+const { spawn } = require('child_process');
+const { appendFileSync } = require('fs');
+const { EOL } = require('os');
+
+function run(cmd) {
+  const subprocess = spawn(cmd, { stdio: 'inherit', shell: true });
+  subprocess.on('exit', exitCode => {
+    process.exitCode = exitCode;
+  });
+}
+
+const key = process.env.INPUT_KEY.toUpperCase();
+
+if (process.env[`STATE_${key}`] !== undefined) {
+  // Are we in the 'post' step?
+  run(process.env.INPUT_POST);
+} else {
+  // Otherwise, this is the main step
+  appendFileSync(process.env.GITHUB_STATE, `${key}=true${EOL}`);
+  run(process.env.INPUT_MAIN);
+}