add image compression workflow

.github/workflows/optimize-images.yml

@@ -0,0 +1,55 @@
+name: Check for image compression
+
+on:
+  workflow_call:
+
+jobs:
+  compress:
+    name: Compress and make a PR if needed
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v4
+
+      - name: Compress Images
+        id: compress-images
+        uses: stellasoftio/image-optimizer-action@v1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          compress-png:	true
+          compress-svg:	false
+          compress-jpg:	false
+          compress-webp: false
+          compress-avif: false
+     
+      - name: Fail if image optimization was needed
+        if: steps.compress-images.outputs.markdown_report != ''
+        run: |
+          echo "Unoptimized image(s) have been detected."
+          exit 1
+          
+
+      - name: Create Pull Request if Needed
+        if: steps.compress-images.outputs.markdown_report != ''
+        if: ${{ failure() && github.event_name == 'pull_request' && !github.event.pull_request.draft }}
+      run: |
+        git config user.name "GitHub GTNH Actions"
+        git config user.email "<>"
+        git switch -c "${FIXED_BRANCH}"
+        git commit -am "optimizing images"
+        git push --force-with-lease origin "${FIXED_BRANCH}"
+        gh pr create \
+          --head "${FIXED_BRANCH}" \
+          --base "${PR_BRANCH}" \
+          --title "Optimising images contained in ${PR_BRANCH} for #${{ github.event.pull_request.number }}" \
+          --body "Automatic image compression, applies to PR #${{ github.event.pull_request.number }}\n\n${{ steps.compress-images.outputs.markdown_report }}" \
+          2>&1 | tee pr-message.log || true
+        gh pr comment "${PR_BRANCH}" -F pr-message.log || true
+      shell: 
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        PR_BRANCH: ${{ github.head_ref }}
+        FIXED_BRANCH: ${{ github.head_ref }}-image-compression
+          
+