Pin Scala Steward to 0.39.0, the last Java 11 build

.github/workflows/scala-steward.yml

@@ -23,6 +23,12 @@ jobs:
       - name: Launch Scala Steward
         uses: scala-steward-org/scala-steward-action@v2.92.0
         with:
+          # Pin Scala Steward itself. The action otherwise downloads the latest
+          # published version on every run; 0.39.1 dropped the Java 11 build and
+          # requires Java 17+, which breaks the temurin:11 runner above. Renovate
+          # tracks this pin; a bump past 0.39.0 fails on first run until the
+          # runner is moved to JDK 17.
+          scala-steward-version: 0.39.0
           # Pin the sbt and scalafmt versions Scala Steward runs against to the
           # ones used in this repository. Kept in sync by Renovate.
           sbt-version: 1.12.13

renovate.json

@@ -23,6 +23,14 @@
       "datasourceTemplate": "github-releases",
       "extractVersionTemplate": "^v(?<version>.*)$"
     },
+    {
+      "customType": "regex",
+      "managerFilePatterns": ["/^\\.github/workflows/.*\\.ya?ml$/"],
+      "matchStrings": ["scala-steward-version: (?<currentValue>\\S+)"],
+      "depNameTemplate": "scala-steward-org/scala-steward",
+      "datasourceTemplate": "github-releases",
+      "extractVersionTemplate": "^v(?<version>.*)$"
+    },
     {
       "customType": "regex",
       "managerFilePatterns": ["/^project/build\\.properties$/"],
@@ -56,6 +64,11 @@
     {
       "matchPackageNames": ["scalameta/scalafmt"],
       "groupName": "scalafmt"
+    },
+    {
+      "description": "Pinned to 0.39.0, the last Java 11 build; 0.39.1+ requires Java 17+ and will fail on the temurin:11 runner in scala-steward.yml. Bump PRs are intentionally left uncapped: a bump beyond 0.39.0 fails first run and is resolved by moving the runner to JDK 17.",
+      "matchPackageNames": ["scala-steward-org/scala-steward"],
+      "groupName": "scala-steward"
     }
   ]
 }