feat(docker): enhance Docker image handling with new validation and parsing logic

- Refactored DockerImage component to use separate properties for image name, tag, and SHA256 digest.
- Introduced DockerImageFormat validation rule to enforce correct image format.
- Updated DockerImageParser to handle new parsing logic for image tags and SHA256 hashes.
- Enhanced UI to separate input fields for image name, tag, and SHA256 digest, improving user experience.
- Added comprehensive tests for DockerImageParser to ensure accurate parsing and validation of image formats.

app/Rules/DockerImageFormat.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class DockerImageFormat implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  \Closure(string, ?string=): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        // Check if the value contains ":sha256:" or ":sha" which is incorrect format
+        if (preg_match('/:sha256?:/i', $value)) {
+            $fail('The :attribute must use @ before sha256 digest (e.g., image@sha256:hash, not image:sha256:hash).');
+
+            return;
+        }
+
+        // Valid formats:
+        // 1. image:tag (e.g., nginx:latest)
+        // 2. registry/image:tag (e.g., ghcr.io/user/app:v1.2.3)
+        // 3. image@sha256:hash (e.g., nginx@sha256:abc123...)
+        // 4. registry/image@sha256:hash
+        // 5. registry:port/image:tag (e.g., localhost:5000/app:latest)
+
+        $pattern = '/^
+            (?:[a-z0-9]+(?:[._-][a-z0-9]+)*(?::[0-9]+)?\/)?  # Optional registry with optional port
+            [a-z0-9]+(?:[._\/-][a-z0-9]+)*                    # Image name (required)
+            (?::[a-z0-9][a-z0-9._-]*|@sha256:[a-f0-9]{64})?   # Optional :tag or @sha256:hash
+        $/ix';
+
+        if (! preg_match($pattern, $value)) {
+            $fail('The :attribute format is invalid. Use image:tag or image@sha256:hash format.');
+        }
+    }
+}