Replace usage of apt with apt-get in Dockerfile since apt is meant to be

an end-user tool according to Super-Linter.

Author: jarkkoka

Dockerfile

@@ -19,8 +19,8 @@ FROM eclipse-temurin:17.0.8_7-jre
 EXPOSE 8080
 
 # install curl
-RUN apt update \
- && apt install -y curl \
+RUN apt-get update \
+ && apt-get install -y curl \
  && rm -rf /var/lib/apt/lists/*
 
 # download script for reading Docker secrets