reusable action for yarnrc setup.

For å redusere duplisering av kode i build pipeline.

Author: josstn

.github/actions/setup-yarnrc/action.yml

@@ -0,0 +1,16 @@
+name: Setup yarnrc.yml
+description: Run yarn config commands so that @navikt/ packages are resolved from github package registry, with neccessary auth.
+inputs:
+  npmAuthToken:
+    description: Token that has packages:read permission for the navikt organization.
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        corepack enable
+        yarn config set npmScopes.navikt.npmRegistryServer "https://npm.pkg.github.com"
+        yarn config set npmScopes.navikt.npmAlwaysAuth true
+        yarn config set npmScopes.navikt.npmAuthToken ${ inputs.npmAuthToken }

.github/workflows/lint-tscheck-build.yml

@@ -16,13 +16,9 @@ jobs:
       - name: Hente kode
         uses: actions/checkout@v4
 
-      - name: Setup .yarnrc.yml
-        run: |
-          yarn config set npmScopes.navikt.npmRegistryServer "https://npm.pkg.github.com"
-          yarn config set npmScopes.navikt.npmAlwaysAuth true
-          yarn config set npmScopes.navikt.npmAuthToken $NPM_AUTH_TOKEN
-        env:
-          NPM_AUTH_TOKEN: ${{ secrets.READER_TOKEN }}
+      - uses: ./.github/actions/setup-yarnrc
+        with:
+          npmAuthToken: ${{ secrets.READER_TOKEN }}
 
       - name: Sette opp Node
         uses: actions/setup-node@v4