Fix container builds when explicitly setting container-runtime

Looking at how this works right now the process is the following:

1. If the user has set `quarkus.native.container-runtime`, Quarkus uses
this verbatim [1] (so if you want rootless you have to say
`podman-rootless` instead of just `podman`

2. If `quarkus.native.container-runtime` is not set Quarkus next picks
up the system property `quarkus-local-container-runtime` [2], this was
introduced in quarkusio#31857 and is
expected to be set by Quarkus and not the user, so the first time we try
to detect the container runtime it should be unset.

3. If the system property is unset, Quarkus then checks the parameter
`quarkus.native.container-runtime` (again) [3]. If it's set it uses it
to test if the set runtime is available or not. If it's not available
it falls back to testing first docker and then
podman [4].

As a result, removing step 1 allows Quarkus to properly check the value
of `quarkus.native.container-runtime` and fully resolve the runtime.

[1] https://github.com/quarkusio/quarkus/blob/f3f97198a3a6892a828540811e0644fad7397acf/core/deployment/src/main/java/io/quarkus/deployment/pkg/steps/NativeImageBuildContainerRunner.java#L31

[2] https://github.com/quarkusio/quarkus/blob/f652f64823f4c54018344c2c941d9819ca9c3d72/core/runtime/src/main/java/io/quarkus/runtime/util/ContainerRuntimeUtil.java#L43

[3] https://github.com/quarkusio/quarkus/blob/f652f64823f4c54018344c2c941d9819ca9c3d72/core/runtime/src/main/java/io/quarkus/runtime/util/ContainerRuntimeUtil.java#L48

[4] https://github.com/quarkusio/quarkus/blob/f652f64823f4c54018344c2c941d9819ca9c3d72/core/runtime/src/main/java/io/quarkus/runtime/util/ContainerRuntimeUtil.java#L96C1-L111

Closes: quarkusio#34725

core/deployment/src/main/java/io/quarkus/deployment/pkg/steps/NativeImageBuildContainerRunner.java

@@ -28,7 +28,7 @@ public abstract class NativeImageBuildContainerRunner extends NativeImageBuildRu
 
     protected NativeImageBuildContainerRunner(NativeConfig nativeConfig) {
         this.nativeConfig = nativeConfig;
-        containerRuntime = nativeConfig.containerRuntime().orElseGet(ContainerRuntimeUtil::detectContainerRuntime);
+        containerRuntime = ContainerRuntimeUtil.detectContainerRuntime();
 
         this.baseContainerRuntimeArgs = new String[] { "--env", "LANG=C", "--rm" };
 

core/deployment/src/main/java/io/quarkus/deployment/pkg/steps/UpxCompressionBuildStep.java

@@ -104,8 +104,7 @@ private boolean runUpxInContainer(NativeImageBuildItem nativeImage, NativeConfig
         List<String> extraArgs = nativeConfig.compression().additionalArgs().orElse(Collections.emptyList());
 
         List<String> commandLine = new ArrayList<>();
-        ContainerRuntimeUtil.ContainerRuntime containerRuntime = nativeConfig.containerRuntime()
-                .orElseGet(ContainerRuntimeUtil::detectContainerRuntime);
+        ContainerRuntimeUtil.ContainerRuntime containerRuntime = ContainerRuntimeUtil.detectContainerRuntime();
         commandLine.add(containerRuntime.getExecutableName());
 
         commandLine.add("run");