Refactor variable assignments and improve script readability in validate-plex-backups.sh and validate-plex-recovery.sh

- Changed inline variable assignments to separate declaration and assignment for clarity.
- Updated condition checks and log messages for better readability and consistency.
- Added a backup of validate-plex-recovery.sh for safety.
- Introduced a new script run-docker-tests.sh for testing setup in Docker containers.
- Enhanced ssh-login.sh to improve condition checks and logging functionality.

immich/backup-immich.sh

@@ -35,6 +35,7 @@ trap cleanup EXIT SIGINT SIGTERM
 ENV_FILE="$(dirname "$0")/../.env"
 if [ -f "$ENV_FILE" ]; then
     echo "Loading environment variables from $ENV_FILE"
+    # shellcheck source=/dev/null
     source "$ENV_FILE"
 else
     echo "Error: .env file not found in $(dirname "$0")/.."
@@ -133,7 +134,8 @@ send_notification() {
     local title="$1"
     local message="$2"
     local status="${3:-info}"  # success, error, warning, info
-    local hostname=$(hostname)
+    local hostname
+    hostname=$(hostname)
 
     # Console notification
     log_message "$title: $message"
@@ -157,7 +159,8 @@ send_notification() {
 # Function to upload to Backblaze B2
 upload_to_b2() {
     local file_path="$1"
-    local filename=$(basename "$file_path")
+    local filename
+    filename=$(basename "$file_path")
 
     # Check if B2 is configured
     if [ -z "$B2_APPLICATION_KEY_ID" ] || [ -z "$B2_APPLICATION_KEY" ] || [ -z "$B2_BUCKET_NAME" ]; then
@@ -344,14 +347,11 @@ echo ""
 echo "=== PHASE 1: DATABASE BACKUP ==="
 log_message "Taking database backup using pg_dumpall as recommended by Immich documentation..."
 # Use pg_dumpall with recommended flags: --clean and --if-exists
-docker exec -t immich_postgres pg_dumpall \
+if ! docker exec -t immich_postgres pg_dumpall \
     --clean \
     --if-exists \
     --username="${DB_USERNAME}" \
-    > "${DB_BACKUP_PATH}"
-
-# Check if the dump was successful
-if [ $? -ne 0 ] || [ ! -s "${DB_BACKUP_PATH}" ]; then
+    > "${DB_BACKUP_PATH}" || [ ! -s "${DB_BACKUP_PATH}" ]; then
     log_message "Error: Database backup failed or created an empty file."
     exit 1
 fi