Icon preview workflow (#2144)

* Add workflow file

* Update workflow file

.github/workflows/icon-review.yml

@@ -0,0 +1,51 @@
+name: Icon Review
+
+on:
+  pull_request:
+    paths:
+      - 'icons/*.svg'
+
+jobs:
+  icon-review:
+    name: Icon Review
+    runs-on: ubuntu-latest
+    env:
+      TARGET_BRANCH: ${{ github.event.pull_request.base.ref }}
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Review SVG files 🔍
+        run: |
+          svgFiles=$(git diff origin/${{ env.TARGET_BRANCH }} --diff-filter=ACMRTUX  --name-only | grep '.svg$')
+          npx svg-icon-review ${svgFiles}
+
+      - name: Post previews in PR
+        uses: actions/github-script@v5
+        with:
+          script: |
+            const fs = require('fs');
+            const path = require('path');
+            const github = require('@actions/github');
+            const core = require('@actions/core');
+
+            const context = github.context;
+            const token = core.getInput('github-token', {required: true});
+            const octokit = github.getOctokit(token);
+
+            const png_files = fs.readdirSync('.').filter(fn => fn.endsWith('.png'));
+
+            for (const png_file of png_files) {
+              const content = fs.readFileSync(png_file, 'base64');
+              const comment = `!${png_file}`;
+
+              octokit.rest.issues.createComment({
+                ...context.repo,
+                issue_number: context.issue.number,
+                body: comment
+              });
+            }
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}