gh-136155: Docs: only add custom OpenGraph protocol meta tags for HTML builds (#136187)

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

Author: m-aciek

Doc/conf.py

@@ -635,13 +635,14 @@
     'image': '_static/og-image.png',
     'line_color': '#3776ab',
 }
-ogp_custom_meta_tags = [
-    '<meta name="theme-color" content="#3776ab">',
-]
-if 'create-social-cards' not in tags:  # noqa: F821
-    # Define a static preview image when not creating social cards
-    ogp_image = '_static/og-image.png'
-    ogp_custom_meta_tags += [
-        '<meta property="og:image:width" content="200">',
-        '<meta property="og:image:height" content="200">',
+if 'builder_html' in tags:  # noqa: F821
+    ogp_custom_meta_tags = [
+        '<meta name="theme-color" content="#3776ab">',
     ]
+    if 'create-social-cards' not in tags:  # noqa: F821
+        # Define a static preview image when not creating social cards
+        ogp_image = '_static/og-image.png'
+        ogp_custom_meta_tags += [
+            '<meta property="og:image:width" content="200">',
+            '<meta property="og:image:height" content="200">',
+        ]

Misc/NEWS.d/next/Documentation/2025-07-01-21-04-47.gh-issue-136155.ufmH4Q.rst

@@ -0,0 +1 @@
+EPUB builds are fixed by excluding non-XHTML-compatible tags.