feat: adding robots.txt override via admin control panel

[1673beta]

What

cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/commit/993532bc1fe0f67d84e16a99ee916f7fff9b0935

Why

Additional info (optional)

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Update CHANGELOG_CHERRYPICK.md
• (If possible) Add tests

[github-actions]

이 PR에 의한 api.json 차이

차이점은 여기에서 볼 수 있음

--- base
+++ head
@@ -11492,6 +11492,12 @@
                     "enableServerMachineStats": {
                       "type": "boolean"
                     },
+                    "robotsTxt": {
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    },
                     "enableIdenticonGeneration": {
                       "type": "boolean"
                     },
@@ -11824,6 +11830,7 @@
                     "enableChartsForFederatedInstances",
                     "enableStatsForFederatedInstances",
                     "enableServerMachineStats",
+                    "robotsTxt",
                     "enableIdenticonGeneration",
                     "manifestJsonOverride",
                     "policies",
@@ -19828,6 +19835,12 @@
                   "enableServerMachineStats": {
                     "type": "boolean"
                   },
+                  "robotsTxt": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
                   "enableIdenticonGeneration": {
                     "type": "boolean"
                   },
@@ -88483,6 +88496,12 @@
               "null"
             ]
           },
+          "robotsTxt": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
           "enableTestcaptcha": {
             "type": "boolean"
           },
@@ -88709,6 +88728,7 @@
           "recaptchaSiteKey",
           "enableTurnstile",
           "turnstileSiteKey",
+          "robotsTxt",
           "enableTestcaptcha",
           "swPublickey",
           "mascotImageUrl",

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