Replace pipx with native apt package installation per QLever quickstart documentation

[Copilot]

Aligns installation method with the QLever quickstart guide, which recommends native packages for Debian/Ubuntu. Removes pipx in favor of native apt package repository installation.

Changes

• Dockerfile: Replace pipx install qlever with native apt package installation

  • Remove pipx and Python dependencies (no longer needed)
  • Add QLever GPG key from packages.qlever.dev
  • Add QLever apt repository to sources list
  • Install qlever via apt install qlever

• entrypoint.sh: Remove pipx version check

• test.sh: Remove pipx verification, fix Java version assertion (11 → 17)

• README.md: Update documentation to reflect native package repository installation method

Installation Method

Following the exact steps from the quickstart guide:

wget -qO - https://packages.qlever.dev/pub.asc | gpg --dearmor | tee /usr/share/keyrings/qlever.gpg > /dev/null
echo "deb [arch=amd64 signed-by=/usr/share/keyrings/qlever.gpg] https://packages.qlever.dev/ $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") main" | tee /etc/apt/sources.list.d/qlever.list
apt-get update
apt-get install -y qlever

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[physikerwelt]

@copilot the link https://docs.qlever.dev/quickstart/#debian-and-ubuntu says something different

sudo apt update && sudo apt install -y wget gpg ca-certificates
wget
 -qO - https://packages.qlever.dev/pub.asc | gpg --dearmor | sudo tee /usr/share/keyrings/qlever.gpg > /dev/null
echo "deb [arch=amd64 signed-by=/usr/share/keyrings/qlever.gpg] https://packages.qlever.dev/ $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") main" | sudo tee /etc/apt/sources.list.d/qlever.list
sudo
 apt update
sudo
 apt install qlever

[Copilot]

@copilot the link https://docs.qlever.dev/quickstart/#debian-and-ubuntu says something different

sudo apt update && sudo apt install -y wget gpg ca-certificates

...

You're absolutely right. I've updated the Dockerfile to use the native apt package installation method as specified in the quickstart guide. The implementation now follows the exact steps from https://docs.qlever.dev/quickstart/#debian-and-ubuntu (commit 5ac3cee).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• packages.qlever.dev
  • Triggering command: /usr/bin/curl curl -I REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)