Increase the size of RepoMetadataFile.data_type

Closes pulp#2501

CHANGES/2501.bugfix

@@ -0,0 +1 @@
+Converted RepoMetadataFile.data_type to TextField in order to drop the max_length restriction.

pulp_rpm/app/migrations/0042_alter_repometadatafile_data_type.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.13 on 2022-05-02 07:36
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('rpm', '0041_rbac_perms'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='repometadatafile',
+            name='data_type',
+            field=models.TextField(),
+        ),
+    ]

pulp_rpm/app/models/custom_metadata.py

@@ -23,7 +23,7 @@ class RepoMetadataFile(Content):
 
     TYPE = "repo_metadata_file"
 
-    data_type = models.CharField(max_length=20)
+    data_type = models.TextField()
     checksum_type = models.CharField(max_length=6)
     checksum = models.CharField(max_length=128)
     relative_path = models.TextField()