Upgrade sbt-ossuminc to 1.1.0 and fix CI credentials

Add GitHub Packages resolver to plugins.sbt so sbt can find the plugin.
Configure sbt credentials in all workflows using GITHUB_TOKEN for
authentication with GitHub Packages.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: reidspencer

.github/workflows/coverage.yml

@@ -33,6 +33,18 @@ jobs:
       - name: Coursier Caching
         uses: coursier/cache-action@v6
 
+      - name: Configure sbt GitHub Packages credentials
+        run: |
+          mkdir -p ~/.sbt/1.0
+          cat > ~/.sbt/1.0/github.sbt << 'EOF'
+          credentials += Credentials(
+            "GitHub Package Registry",
+            "maven.pkg.github.com",
+            "x-access-token",
+            sys.env.getOrElse("GITHUB_TOKEN", "")
+          )
+          EOF
+
       - name: Coverage For JVM projects only
         run: |
           sbt clean coverage \

.github/workflows/hugo.yml

@@ -56,6 +56,18 @@ jobs:
       - name: Coursier Caching
         uses: coursier/cache-action@v6
 
+      - name: Configure sbt GitHub Packages credentials
+        run: |
+          mkdir -p ~/.sbt/1.0
+          cat > ~/.sbt/1.0/github.sbt << 'EOF'
+          credentials += Credentials(
+            "GitHub Package Registry",
+            "maven.pkg.github.com",
+            "x-access-token",
+            sys.env.getOrElse("GITHUB_TOKEN", "")
+          )
+          EOF
+
       - name: Cache ScalaDoc Output
         uses: actions/cache@v4
         with:

.github/workflows/scala.yml

@@ -41,6 +41,18 @@ jobs:
     - name: Coursier Caching
       uses: coursier/cache-action@v6
 
+    - name: Configure sbt GitHub Packages credentials
+      run: |
+        mkdir -p ~/.sbt/1.0
+        cat > ~/.sbt/1.0/github.sbt << 'EOF'
+        credentials += Credentials(
+          "GitHub Package Registry",
+          "maven.pkg.github.com",
+          "x-access-token",
+          sys.env.getOrElse("GITHUB_TOKEN", "")
+        )
+        EOF
+
     - name: Cache SBT Build Outputs
       uses: actions/cache@v4
       with:

project/plugins.sbt

@@ -1,4 +1,7 @@
-addSbtPlugin("com.ossuminc" % "sbt-ossuminc" % "1.0.0")
+// GitHub Packages resolver for sbt-ossuminc
+resolvers += "GitHub Packages" at "https://maven.pkg.github.com/ossuminc/sbt-ossuminc"
+
+addSbtPlugin("com.ossuminc" % "sbt-ossuminc" % "1.1.0")
 
 // This enables sbt-bloop to create bloop config files for Metals editors
 // Uncomment locally if you use metals, otherwise don't slow down other