Get started.

.gitlab-ci.yaml

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+image: quay.io/podman/stable
+
+stages:
+  - build
+  - push
+
+variables:
+  IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+
+before_script:
+  - echo -n $CI_REGISTRY_PASSWORD | podman login -u "$CI_REGISTRY_USER" $CI_REGISTRY
+
+build:
+  stage: build
+  script:
+    - podman build -t $IMAGE_TAG .
+    - podman push $IMAGE_TAG
+  when: manual

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>jdk21-builder</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+	</buildSpec>
+	<natures>
+	</natures>
+</projectDescription>

Containerfile

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+FROM docker.io/fedora:40
+
+RUN dnf install -y java-21-openjdk-headless nodejs python gcc gcc-c++ git podman
+
+CMD ["/bin/bash"]