feat: add dynamic versioning and automated deployment with rollback capability

- Implement setuptools-scm for dynamic version management from git tags
- Refactor CI/CD into separate build and deploy jobs with artifact sharing
- Add versioned releases with timestamp-based deployment directories
- Implement health checks and automatic rollback on deployment failure
- Extract deployment logic into reusable shell scripts
- Add Docker layer caching to speed up builds
- Include version info in Django context and build args

scripts/retry.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Retry function with exponential backoff
+# Usage: source retry.sh && retry <command>
+
+retry() {
+  local max_attempts=3
+  local delay=5
+  local attempt=1
+  
+  until "$@"; do
+    if [ "$attempt" -ge "$max_attempts" ]; then
+      echo "Command failed after $max_attempts attempts: $*"
+      return 1
+    fi
+    
+    echo "Command failed (attempt $attempt/$max_attempts): $*"
+    echo "Retrying in $delay seconds..."
+    sleep "$delay"
+    attempt=$((attempt + 1))
+    delay=$((delay * 2))  # Exponential backoff
+  done
+}