refactor(scripts): move debian scripts under linux dir

- Moved upgrade-gitlab.sh from Debian/ to Linux/Debian/
- Moved import-pubkeys-from-github.sh from Debian/ to Linux/

Linux/Debian/upgrade-gitlab.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# =================================================================
+# GitLab Upgrade and Patch Script
+# =================================================================
+
+# Ensure the script is run as root to have necessary permissions for package management and patching
+if [ "$EUID" -ne 0 ]; then
+  echo "Please run as root"
+  exit
+fi
+
+echo "--- 1. Stopping Puma and Sidekiq ---"
+# Stop data processing and web services before upgrading to reduce the risk of database migration issues
+gitlab-ctl stop puma
+gitlab-ctl stop sidekiq
+
+echo "--- 2. Updating GitLab via apt ---"
+# Update package sources and install the latest version of gitlab-ce (change to gitlab-ee if using the EE edition)
+apt-get update
+apt-get install --only-upgrade gitlab-ce -y
+
+echo "--- 3. Applying Custom Patches ---"
+
+# 3.1 Applying language switcher patch
+# if [ -f /etc/gitlab/patches/language_fix.patch ]; then
+#     echo "Applying language_fix.patch..."
+#     patch /opt/gitlab/embedded/service/gitlab-rails/app/helpers/preferred_language_switcher_helper.rb < /etc/gitlab/patches/language_fix.patch
+# else
+#     echo "Warning: language_fix.patch not found!"
+# fi
+
+# # 3.2 Applying footer patch (e.g., ICP number)
+# if [ -f /etc/gitlab/patches/beian.patch ]; then
+#     echo "Applying beian.patch..."
+#     patch /opt/gitlab/embedded/service/gitlab-rails/app/views/devise/shared/_footer.html.haml < /etc/gitlab/patches/beian.patch
+# else
+#     echo "Warning: beian.patch not found!"
+# fi
+
+echo "--- 4. Verifying GitLab Version ---"
+# Output the currently installed version information
+gitlab-rake gitlab:env:info
+
+echo "--- 5. Restarting GitLab Services ---"
+# After upgrading, GitLab usually runs reconfigure automatically, but to ensure patches take effect, perform a full restart
+gitlab-ctl restart
+
+echo "--- Process Completed Successfully ---"

Linux/import-pubkeys-from-github.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# Ensure a list of usernames is provided
+if [ -z "$1" ]; then
+    echo "Error: No usernames provided."
+    echo "Usage: bash $0 username1,username2"
+    exit 1
+fi
+
+TARGET_FILE="$HOME/.ssh/authorized_keys"
+
+# Initialising: Ensure .ssh directory exists with correct secure permissions
+mkdir -p "$HOME/.ssh"
+chmod 700 "$HOME/.ssh"
+
+# Ensure the authorised keys file exists so we can safely check its content later
+touch "$TARGET_FILE"
+chmod 600 "$TARGET_FILE"
+
+# Split the first argument by commas into an array
+IFS=',' read -r -a USERNAMES <<< "$1"
+
+for USERNAME in "${USERNAMES[@]}"; do
+    # Trim potential leading/trailing whitespaces from username
+    USERNAME=$(echo "$USERNAME" | xargs)
+    
+    if [ -z "$USERNAME" ]; then
+        continue
+    fi
+
+    echo "Fetching SSH public keys for GitHub user: ${USERNAME}..."
+
+    # Fetch keys from GitHub API (following redirects)
+    KEYS=$(curl -sSL "https://github.com/${USERNAME}.keys")
+
+    # Check if the user exists or has any public keys
+    if [ -z "$KEYS" ] || [[ "$KEYS" == *"Not Found"* ]]; then
+        echo "Warning: No public keys found for user '${USERNAME}' or user does not exist. Skipping."
+        continue
+    fi
+
+    # Format the header exactly as required
+    HEADER="# === SSH PUB KEY FOR ${USERNAME} ==="
+
+    # Check if this specific header already exists to avoid duplicate entries
+    if grep -qF "$HEADER" "$TARGET_FILE"; then
+        echo "Notice: Keys for '${USERNAME}' have already been imported previously. Skipping to prevent duplicates."
+        continue
+    fi
+
+    # Append the formatted block to the authorised keys file safely
+    # The awk block ensures that the keys always end with a proper newline character
+    {
+        echo ""
+        echo "$HEADER"
+        echo "$KEYS" | awk '1; END {if (NR && !/\n$/) print ""}'
+    } >> "$TARGET_FILE"
+
+    echo "Successfully appended keys for ${USERNAME}."
+done
+
+echo "SSH key import process completed."