fix: prepare samples script

scripts/prepare_samples.sh

@@ -1,14 +1,16 @@
 #!/bin/bash
 
-# Check if the "DISABLE_SAMPLES" environment variable is set
-if [ -n "${DISABLE_SAMPLES}" ]; then
-    echo "DISABLE_SAMPLES is set. Skipping sample preparation."
+# Check if the "PREPARE_SAMPLES" environment variable is set
+if [ -z "${PREPARE_SAMPLES}" ]; then
+    echo "PREPARE_SAMPLES is unset or set to the empty string. Skipping sample preparation."
     exit 0
 fi
 
 # Read JSON file into a variable
 json=$(cat sample_songs.json)
 
+mkdir -p "/tmp/vocal_remover"
+
 # Iterate through keys and values
 for name in $(echo "${json}" | jq -r 'keys[]'); do
     url=$(echo "${json}" | jq -r --arg name "${name}" '.[$name]')
@@ -16,7 +18,6 @@ for name in $(echo "${json}" | jq -r 'keys[]'); do
 
     # Download with pytube
     yt-dlp ${url} -o "/tmp/${name}" --format "bestaudio/best"
-    mkdir -p "/tmp/vocal_remover"
 
     # Run inference
     python inference.py --input /tmp/${name} --output /tmp
@@ -34,7 +35,6 @@ for name in $(echo "${json_separate}" | jq -r 'keys[]'); do
 
     # Download with pytube
     yt-dlp ${url} -o "/tmp/${name}" --format "bestaudio/best"  --download-sections "*45-110"
-    mkdir -p "/tmp/vocal_remover"
 
     # Run inference
     python inference.py --input /tmp/${name} --output /tmp --only_no_vocals false