feat: Add env variable for optionally disabling cache feature

.env.example

@@ -1,2 +1,8 @@
-# replace ghp_example with your GitHub PAT token
+# replace ghp_example with your GitHub PAT token (see README for instructions)
 TOKEN=ghp_example
+
+# optional: Add a comma-separated list of GitHub usernames to whitelist (only these users' streaks will be displayed)
+# WHITELIST=DenverCoder1
+
+# optional: disable caching (not recommended, may cause rate limit issues)
+# DISABLE_CACHE=true

src/index.php

@@ -46,8 +46,11 @@
         "exclude_days" => $excludeDaysRaw,
     ];
 
-    // Check for cached stats first (24 hour cache)
-    $cachedStats = getCachedStats($user, $cacheOptions);
+    // Check if cache is disabled
+    $useCache = !isset($_SERVER["DISABLE_CACHE"]) || strtolower($_SERVER["DISABLE_CACHE"]) !== "true";
+
+    // Check for cached stats first (24 hour cache) unless cache is disabled
+    $cachedStats = $useCache ? getCachedStats($user, $cacheOptions) : null;
 
     if ($cachedStats !== null) {
         // Use cached stats - instant response!
@@ -65,8 +68,10 @@
             $stats = getContributionStats($contributions, $excludeDays);
         }
 
-        // Cache the stats for 24 hours
-        setCachedStats($user, $cacheOptions, $stats);
+        // Cache the stats for 24 hours unless cache is disabled
+        if ($useCache) {
+            setCachedStats($user, $cacheOptions, $stats);
+        }
     }
 
     renderOutput($stats);