#1795: one liner installer

[shodiBoy1]

This PR fixes #1795

Implemented changes:

• Added install.sh - a one-liner install script that detects OS/architecture, downloads the latest IDEasy release, and runs setup automatically. Works on macOS (Intel & ARM), Linux (x64 & ARM64), and Windows (via Git Bash).
• Added website/ - a landing page (index.html + style.css) with install instructions, copy-to-clipboard command, and an overview of IDEasy features.

This simplifies the current installation process from:

1. Go to GitHub releases page
2. Find the correct archive for your OS and architecture
3. Download it manually
4. Extract it
5. Run setup

To just:
bash -c "$(curl -fsSL https://raw.githubusercontent.com/devonfw/IDEasy/main/install.sh)"

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Checklist for this PR

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled
  with internal

[coveralls]

Pull Request Test Coverage Report for Build 23889953804

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 70.634%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/tool/ide/IdeToolCommandlet.java	1	78.33%

Totals
Change from base Build 23887857697:	-0.01%
Covered Lines:	10885
Relevant Lines:	14791

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💛 - Coveralls

[MarvMa]

I tested the install script using WSL with Debian. The script correctly detected the operating system, downloaded the current IDEasy version, and started it. However, the application got stuck during the “Running setup” step.
The issue might be that, during installation, the user is required to accept a license agreement via interactive input. If the setup script does suppress the IDEasy installation logs and does not allow user input, this could explain the problem. Allowing user input during the setup phase should fix this issue.

[hohwille]

I tested the install script using WSL with Debian. The script correctly detected the operating system, downloaded the current IDEasy version, and started it. However, the application got stuck during the “Running setup” step. The issue might be that, during installation, the user is required to accept a license agreement via interactive input. If the setup script does suppress the IDEasy installation logs and does not allow user input, this could explain the problem. Allowing user input during the setup phase should fix this issue.

Thanks for testing, @MarvMa. Is your problem not simply the bug #1770?
That bug is already fixed and will disappear with the next release end of this week.
You may test if you just type "yes" and hit enter if the installer script then continues and installation is successful.

[MarvMa]

I tested the install script using WSL with Debian. The script correctly detected the operating system, downloaded the current IDEasy version, and started it. However, the application got stuck during the “Running setup” step. The issue might be that, during installation, the user is required to accept a license agreement via interactive input. If the setup script does suppress the IDEasy installation logs and does not allow user input, this could explain the problem. Allowing user input during the setup phase should fix this issue.

Thanks for testing, @MarvMa. Is your problem not simply the bug #1770? That bug is already fixed and will disappear with the next release end of this week. You may test if you just type "yes" and hit enter if the installer script then continues and installation is successful.

Correct! This has been the issue. The one-liner worked after typing "yes" during the installation 👍

[MarvMa]

The install script works as expected. Nice work. This improves the UX for new Users 👍

[hohwille]

I created an issue to make the feature transparent and so we can also add it to our CHANGELOG.
To be pragmatic, I will just merge it as is now and add it to setup.adoc and CHANGELOG after merge.

[hohwille]

@shodiBoy1 thank your for your PR and your great idea to improve IDEasy. 🥇
As I just commented, I will merge this PR and after that add the issue I just created for it to our CHANGELOG.