Fix Docker build failures and add multi-platform support

DOCKER_BUILD.md

@@ -77,8 +77,37 @@ docker buildx build --platform linux/arm/v7 \
 
 ## Running the Container
 
+### First-Time Setup (Required)
+
+On the first run, you need to create an admin account. Run the container in interactive mode:
+
+```bash
+# Create recon_data directory first (if it doesn't exist)
+mkdir -p recon_data
+
+# Run in interactive mode to create admin account
+docker run -it \
+  --name subscraper \
+  -p 8342:8342 \
+  -v $(pwd)/recon_data:/app/recon_data \
+  subscraper:latest
+
+# Follow the prompts to:
+# 1. Create an admin account (username and password)
+# 2. Configure basic settings (or skip and configure later via web UI)
+```
+
+After the admin account is created and the server starts, you can:
+- Press `Ctrl+C` to stop the server
+- Remove the container: `docker rm subscraper`
+- Run in detached mode (see "Basic Run" below)
+
+**Important**: The admin account and all configuration is stored in the `recon_data` volume, so you only need to do this once.
+
 ### Basic Run
 
+After initial setup, run in detached mode:
+
 ```bash
 docker run -d \
   --name subscraper \
@@ -212,7 +241,9 @@ All completed job reports, scan results, and configuration will be preserved.
 
 ## Docker Compose (Optional)
 
-Create a `docker-compose.yml` file for easier management:
+### First-Time Setup with Docker Compose
+
+Create a `docker-compose.yml` file:
 
 ```yaml
 version: '3.8'
@@ -239,10 +270,17 @@ services:
       start_period: 5s
 ```
 
-Then run:
+**First Run**: Create admin account in interactive mode:
 
 ```bash
-# Start the service
+# Build and run in interactive mode for first-time setup
+# Use --service-ports to expose port 8342 during setup
+docker-compose run --rm --service-ports subscraper
+
+# Follow the prompts to create admin account
+# After setup, stop with Ctrl+C
+
+# Then start normally in detached mode
 docker-compose up -d
 
 # View logs
@@ -260,6 +298,24 @@ docker-compose down
 
 ## Troubleshooting
 
+### Issue: "ERROR: No admin account exists"
+
+If the container exits immediately with this error, you need to create an admin account first:
+
+```bash
+# Run in interactive mode to create admin account
+docker run -it \
+  --name subscraper \
+  -p 8342:8342 \
+  -v $(pwd)/recon_data:/app/recon_data \
+  subscraper:latest
+
+# Or with docker-compose:
+docker-compose run --rm subscraper
+```
+
+Follow the prompts to create an admin account. The account is saved in `recon_data/users.json` and persists across container restarts.
+
 ### Issue: "no matching manifest"
 
 This means the image wasn't built for your platform. Rebuild with:

Dockerfile

@@ -1,37 +1,27 @@
 # Multi-platform Dockerfile for subScraper reconnaissance tool
 # Supports linux/amd64, linux/arm64, linux/arm/v7
 
-FROM --platform=$BUILDPLATFORM python:3.11-slim AS base
+FROM python:3.11-slim AS base
 
 # Set environment variables
 ENV PYTHONUNBUFFERED=1 \
-    DEBIAN_FRONTEND=noninteractive \
-    GO_VERSION=1.21.5
+    DEBIAN_FRONTEND=noninteractive
 
-# Install system dependencies
+# Install system dependencies and Go from Debian repository
+# This ensures compatibility across all platforms and avoids download issues
 RUN apt-get update && apt-get install -y \
     curl \
     wget \
     git \
     build-essential \
     libssl-dev \
     ca-certificates \
+    golang \
+    unzip \
     && rm -rf /var/lib/apt/lists/*
 
-# Install Go (required for many recon tools)
-ARG TARGETARCH
-RUN case ${TARGETARCH} in \
-        "amd64") GO_ARCH="amd64" ;; \
-        "arm64") GO_ARCH="arm64" ;; \
-        "arm") GO_ARCH="armv6l" ;; \
-        *) echo "Unsupported architecture: ${TARGETARCH}" && exit 1 ;; \
-    esac && \
-    wget -q https://go.dev/dl/go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && \
-    tar -C /usr/local -xzf go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && \
-    rm go${GO_VERSION}.linux-${GO_ARCH}.tar.gz
-
-ENV PATH="/usr/local/go/bin:${PATH}" \
-    GOPATH="/root/go" \
+# Set Go environment variables
+ENV GOPATH="/root/go" \
     GOBIN="/root/go/bin"
 
 ENV PATH="${GOBIN}:${PATH}"
@@ -53,8 +43,11 @@ RUN go install -v github.com/ffuf/ffuf/v2@latest
 # Install gowitness for screenshots
 RUN go install -v github.com/sensepost/gowitness@latest
 
-# Install findomain (binary release)
-RUN case ${TARGETARCH} in \
+# Install findomain (binary release) - optional, architecture-specific
+# Declare TARGETARCH for architecture detection (defaults to amd64 if not set by buildx)
+# Note: When building without buildx, TARGETARCH will default to amd64
+ARG TARGETARCH
+RUN case ${TARGETARCH:-amd64} in \
         "amd64") FINDOMAIN_ARCH="x86_64" ;; \
         "arm64") FINDOMAIN_ARCH="aarch64" ;; \
         "arm") FINDOMAIN_ARCH="armv7" ;; \
@@ -64,13 +57,23 @@ RUN case ${TARGETARCH} in \
     unzip -q findomain.zip && \
     chmod +x findomain && \
     mv findomain /usr/local/bin/ && \
-    rm findomain.zip || echo "Findomain installation skipped for ${TARGETARCH}"
+    rm findomain.zip || echo "Findomain installation skipped for ${TARGETARCH:-amd64}"
 
-# Install Python-based tools
-RUN pip install --no-cache-dir sublist3r nikto-parser
+# Install Python-based tool (sublist3r)
+# Note: nikto-parser was removed as it doesn't exist in PyPI
+RUN pip install --no-cache-dir sublist3r
 
-# Install nikto (Perl-based)
-RUN apt-get update && apt-get install -y nikto && rm -rf /var/lib/apt/lists/*
+# Install nikto (Perl-based) from GitHub
+# First install Perl and dependencies
+RUN apt-get update && apt-get install -y \
+    perl \
+    libnet-ssleay-perl \
+    libjson-perl \
+    libxml-writer-perl \
+    && rm -rf /var/lib/apt/lists/* && \
+    git clone https://github.com/sullo/nikto /opt/nikto && \
+    ln -s /opt/nikto/program/nikto.pl /usr/local/bin/nikto && \
+    chmod +x /opt/nikto/program/nikto.pl
 
 # Install nmap
 RUN apt-get update && apt-get install -y nmap && rm -rf /var/lib/apt/lists/*