feat(docker-build): add registry input and update secret names

Author: TartanLeGrand

.github/workflows/docker-build.yml

@@ -27,10 +27,14 @@ on:
         description: 'Push Docker Image to Registry'
         default: false
         type: boolean
+      registry:
+        description: 'Docker Registry'
+        default: 'docker.io'
+        type: string
     secrets:
-      dockerhub-username:
+      username:
         required: false
-      dockerhub-pat:
+      password:
         required: false
 
 jobs:
@@ -50,8 +54,9 @@ jobs:
         if: ${{ inputs.push }}
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.dockerhub-username }}
-          password: ${{ secrets.dockerhub-pat }}
+          registry: ${{ inputs.registry }}
+          username: ${{ secrets.username }}
+          password: ${{ secrets.password }}
 
       - name: Run Hadolint Dockerfile linter
         if: ${{ inputs.hadolint }}