use fully describes images names in container builds with Gradle

(cherry picked from commit 57edf92e30cd3e5bec594399b8a21fc1da31d549)

kontor-quarkus/Containerfile

@@ -1,5 +1,5 @@
 # ----------------------------------------------------------------------- #
-FROM gradle:9.2-jdk AS builder
+FROM docker.io/library/gradle:9.2-jdk AS builder
 WORKDIR /
 COPY ./src/ ./src/
 COPY ./build.gradle.kts ./

kontor-spring/Containerfile

@@ -1,5 +1,5 @@
 # ----------------------------------------------------------------------- #
-FROM gradle:8.7-jdk AS builder
+FROM docker.io/library/gradle:8.7-jdk AS builder
 WORKDIR /
 COPY ./src/main/ ./src/main/
 COPY ./frontend/ ./frontend/

script/setup

@@ -59,7 +59,7 @@ else
         --health-interval=1s \
         --health-timeout=5s \
         --health-retries=10 \
-        postgres:17
+        docker.io/library/postgres:17
 fi
 
 echo "==> Setting up container adminer"
@@ -68,7 +68,7 @@ if podman container exists adminer; then
         echo "  => adminer is running"
     fi
 else
-    podman run -d --replace --pod kontor --name adminer adminer
+    podman run -d --replace --pod kontor --name adminer docker.io/library/adminer
 fi
 
 echo "==> Setting up container activemq"