diff --git a/builder/dockerfile.alpine_319.apk.build b/builder/dockerfile.alpine_319.apk.build
index c860e4b..35e0dc7 100644
--- a/builder/dockerfile.alpine_319.apk.build
+++ b/builder/dockerfile.alpine_319.apk.build
@@ -11,23 +11,10 @@ WORKDIR $HOME/kasmvncserver
 ARG KASMVNC_ALPINE_PRIVATE_KEY
 ARG KASMVNC_ALPINE_PUBLIC_KEY
 ENV APK_KEYS_DIR=/etc/apk/keys
-ENV BEGIN_PRIVATE_KEY='-----BEGIN PRIVATE KEY-----'
-ENV END_PRIVATE_KEY='-----END PRIVATE KEY-----'
-ENV BEGIN_PUBLIC_KEY='-----BEGIN PUBLIC KEY-----'
-ENV END_PUBLIC_KEY='-----END PUBLIC KEY-----'
-RUN if echo "$KASMVNC_ALPINE_PRIVATE_KEY" | grep -q -- "$BEGIN_PRIVATE_KEY"; then \
-      echo "$KASMVNC_ALPINE_PRIVATE_KEY" > $APK_KEYS_DIR/kasmvnc_signing_key.rsa; \
-    else \
-      echo -e "$BEGIN_PRIVATE_KEY\n$KASMVNC_ALPINE_PRIVATE_KEY\n$END_PRIVATE_KEY" > \
-        $APK_KEYS_DIR/kasmvnc_signing_key.rsa; \
-    fi
-RUN echo KASMVNC_ALPINE_PRIVATE_KEY "$KASMVNC_ALPINE_PRIVATE_KEY"
-RUN if echo "$KASMVNC_ALPINE_PUBLIC_KEY" | grep -q -- "$BEGIN_PUBLIC_KEY"; then \
-      echo "$KASMVNC_ALPINE_PUBLIC_KEY" > $APK_KEYS_DIR/kasmvnc_signing_key.rsa.pub; \
-    else \
-      echo -e "$BEGIN_PUBLIC_KEY\n$KASMVNC_ALPINE_PUBLIC_KEY\n$END_PUBLIC_KEY" > \
-        $APK_KEYS_DIR/kasmvnc_signing_key.rsa.pub; \
-    fi
+
+ENV SCRIPTS_DIR=/tmp/scripts
+COPY builder/scripts $SCRIPTS_DIR
+RUN $SCRIPTS_DIR/install_alpine_signing_keys
 
 RUN useradd -m docker && echo "docker:docker" | chpasswd
 RUN echo 'docker ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers
diff --git a/builder/scripts/install_alpine_signing_keys b/builder/scripts/install_alpine_signing_keys
new file mode 100755
index 0000000..0fbe3da
--- /dev/null
+++ b/builder/scripts/install_alpine_signing_keys
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+set -e
+
+install_private_signing_key() {
+  if echo "$KASMVNC_ALPINE_PRIVATE_KEY" | grep -q -- "$BEGIN_PRIVATE_KEY"; then
+    echo "$KASMVNC_ALPINE_PRIVATE_KEY" > $APK_KEYS_DIR/kasmvnc_signing_key.rsa
+  else
+    echo -e "$BEGIN_PRIVATE_KEY\n$KASMVNC_ALPINE_PRIVATE_KEY\n$END_PRIVATE_KEY" > \
+      $APK_KEYS_DIR/kasmvnc_signing_key.rsa
+  fi
+}
+
+install_public_signing_key() {
+  if echo "$KASMVNC_ALPINE_PUBLIC_KEY" | grep -q -- "$BEGIN_PUBLIC_KEY"; then \
+    echo "$KASMVNC_ALPINE_PUBLIC_KEY" > $APK_KEYS_DIR/kasmvnc_signing_key.rsa.pub
+  else
+    echo -e "$BEGIN_PUBLIC_KEY\n$KASMVNC_ALPINE_PUBLIC_KEY\n$END_PUBLIC_KEY" > \
+      $APK_KEYS_DIR/kasmvnc_signing_key.rsa.pub
+  fi
+}
+
+BEGIN_PRIVATE_KEY='-----BEGIN PRIVATE KEY-----'
+END_PRIVATE_KEY='-----END PRIVATE KEY-----'
+BEGIN_PUBLIC_KEY='-----BEGIN PUBLIC KEY-----'
+END_PUBLIC_KEY='-----END PUBLIC KEY-----'
+
+install_private_signing_key
+install_public_signing_key