Fix Docker build failures and add multi-platform support

[Copilot]

Docker build fails due to blocked external dependencies and missing packages. The image cannot be built reliably on macOS.

Changes

Dockerfile

• Install Go from Debian repos instead of downloading from go.dev (redirects to blocked dl.google.com)
• Install nikto from GitHub with Perl dependencies (libjson-perl, libxml-writer-perl) - not available in Debian Trixie
• Remove non-existent nikto-parser from pip install
• Add unzip dependency for findomain installation
• Declare TARGETARCH with default value amd64 at point of use

Documentation

• Add first-time setup instructions - app requires interactive admin account creation before detached mode
• Add troubleshooting section for "No admin account exists" error
• Fix docker-compose command to include --service-ports flag

Build Validation

# All tools successfully install:
subfinder, httpx, nuclei, dnsx, assetfinder, waybackurls, 
gau, github-subdomains, ffuf, gowitness, nikto, nmap, sublist3r

# Multi-platform support ready:
docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7

First run requires interactive setup:

docker run -it -p 8342:8342 -v $(pwd)/recon_data:/app/recon_data subscraper:latest
# Create admin account, then run detached

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:

• dl.google.com
  • Triggering command: /usr/bin/wget wget -q REDACTED (dns block)
  • Triggering command: /usr/bin/wget wget -q REDACTED /usr/bin/lzcat conf�� l.deb --global /opt/pipx_bin/git credential.helpe/var/lib/dpkg/info/libcrypt-dev:amd64.postinst (dns block)
  • Triggering command: /usr/bin/wget wget --spider REDACTED git conf�� get --global (dns block)
• https://api.github.com/repos/Findomain/Findomain/releases/latest
  • Triggering command: /usr/bin/curl curl -s REDACTED rchives/krb5-locales_1.21.3-5_al/var/lib/dpkg/tmp.ci rchi�� -cpp-x86-64-linux-gnu_4%3a14.2.0-1_amd64.deb .1-1_amd64.deb eb rchives/libkrb5sbash rchives/libcom-e--norc rchives/libk5cry--noprofile rchives/libkeyutils1_1.6.3-6_amd64.deb rchi�� -libgcc-14-dev_14.2.0-19_amd64.deb p.ci plit delete 8ssvxmiag391gxhggtvbsm75b (http 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)

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.