fix: workflows failing on contributor forks (#563)

Author: gabrielmfern

.github/workflows/lint.yml

@@ -10,8 +10,8 @@ jobs:
     container:
       image: node:20
       credentials:
-        username: ${{ vars.DOCKER_HUB_USERNAME }}
-        password: ${{ secrets.DOCKER_HUB_API_KEY }}
+        username: ${{ vars.DOCKER_HUB_USERNAME || '' }}
+        password: ${{ secrets.DOCKER_HUB_API_KEY || '' }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/pin-dependencies-check.yml

@@ -10,8 +10,8 @@ jobs:
     container:
       image: node:20
       credentials:
-        username: ${{ vars.DOCKER_HUB_USERNAME }}
-        password: ${{ secrets.DOCKER_HUB_API_KEY }}
+        username: ${{ vars.DOCKER_HUB_USERNAME || '' }}
+        password: ${{ secrets.DOCKER_HUB_API_KEY || '' }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/pr-title-check.yml

@@ -8,8 +8,8 @@ jobs:
     container:
       image: node:20
       credentials:
-        username: ${{ vars.DOCKER_HUB_USERNAME }}
-        password: ${{ secrets.DOCKER_HUB_API_KEY }}
+        username: ${{ vars.DOCKER_HUB_USERNAME || '' }}
+        password: ${{ secrets.DOCKER_HUB_API_KEY || '' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/tests.yml

@@ -10,8 +10,8 @@ jobs:
     container:
       image: node:20
       credentials:
-        username: ${{ vars.DOCKER_HUB_USERNAME }}
-        password: ${{ secrets.DOCKER_HUB_API_KEY }}
+        username: ${{ vars.DOCKER_HUB_USERNAME || '' }}
+        password: ${{ secrets.DOCKER_HUB_API_KEY || '' }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4