add flair validation

.github/workflows/flair.yml

@@ -0,0 +1,16 @@
+name: Validate Flair
+
+on:
+  push:
+    paths:
+      - 'public/flair/**'
+  pull_request:
+    paths:
+      - 'public/flair/**'
+
+jobs:
+  validate-flair:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: ./bin/validate-flair public/flair/img/

bin/validate-flair

@@ -0,0 +1,50 @@
+#!/bin/bash -e
+
+if [ -z "$1" ]; then
+    echo "Usage: $0 <path/to/flair/dir>"
+    exit 1
+fi
+
+exit_code=0
+
+for img_file in "$1"/*; do
+    if [[ ! "$img_file" =~ \.webp$ ]]; then
+        echo "Not a WEBP: $img_file"
+        exit_code=1
+        continue
+    fi
+
+    dimensions=$(identify -format "%wx%h" "$img_file")
+
+    width=$(echo "$dimensions" | cut -d 'x' -f 1)
+    height=$(echo "$dimensions" | cut -d 'x' -f 2)
+
+    if [ "$width" -ne "$height" ]; then
+        echo "Not square: $img_file ($dimensions)"
+        exit_code=1
+
+        echo "Converting to square..."
+        max_dimension=$((width > height ? width : height))
+        convert "$img_file" -gravity center -background transparent -extent "${max_dimension}x${max_dimension}" "$img_file"
+    fi
+
+    if [ "$width" -lt 60 ] || [ "$width" -gt 100 ]; then
+        echo "Not between 60-100px: $img_file ($dimensions)"
+        exit_code=1
+
+        echo "Resizing to 100px..."
+        convert "$img_file" -resize 100x100 "$img_file"
+    fi
+
+    # animated WEBPs contain the string "ANMF" in the file
+    if grep -q "ANMF" "$img_file"; then
+        echo "Animated: $img_file"
+        exit_code=1
+    fi
+done
+
+if [ "$exit_code" -eq 0 ]; then
+    echo "✅ Images are OK"
+fi
+
+exit $exit_code