Declare the credential form of seven offers, read from each provider's code, so the plan says what the software makes (issue 1954)

A login per consumer is pair (postgres, keycloak's client, gitea's npm registry, the vault's secret); an offer whose consumers present none is none (gitea's git and forge account, route-adapter's route).

modules/gitea/module.json

@@ -399,6 +399,7 @@
   "provides": [
     {
       "name": "npm-package-registry",
+      "credential": {"form": "pair"},
       "scope": "mesh",
       "identity": {
         "max": 40,
@@ -407,6 +408,7 @@
     },
     {
       "name": "git",
+      "credential": {"form": "none"},
       "scope": "mesh"
     },
     {
@@ -419,6 +421,7 @@
     },
     {
       "name": "forge-account",
+      "credential": {"form": "none"},
       "scope": "mesh"
     }
   ],

modules/keycloak/module.json

@@ -9,6 +9,7 @@
   "provides": [
     {
       "name": "oidc-client",
+      "credential": {"form": "pair"},
       "scope": "mesh",
       "identity": {
         "max": 255,

modules/mesh-vault/module.json

@@ -5,6 +5,7 @@
   "provides": [
     {
       "name": "secret",
+      "credential": {"form": "pair"},
       "scope": "mesh",
       "identity": {
         "in": "a vault entry"

modules/postgres/module.json

@@ -9,6 +9,7 @@
   "provides": [
     {
       "name": "postgres-database",
+      "credential": {"form": "pair"},
       "scope": "mesh",
       "identity": {
         "max": 63,

modules/route-adapter/module.json

@@ -9,6 +9,7 @@
   "provides": [
     {
       "name": "route",
+      "credential": {"form": "none"},
       "scope": "mesh",
       "identity": false
     }