Dockerize 'convert' in the publish script.

publish

@@ -20,11 +20,14 @@ chmod 755 ${TEMP};
 ##
 # .psd --> .jpg ONLY in 'src/'
 #
+docker run -v$(pwd):/x -w/x --rm -i alpine:3.14 <<'EOF'
+apk add imagemagick;
 find ${HERE} -type f -name "*.psd" | while read k; do
     f="${k#*${HERE}}";
     mkdir -p "${TEMP}${f%/*}";
     convert "${k}[0]" -strip "${TEMP}${f%*.psd}.jpg";
 done
+EOF
 
 ##
 # template injection