ci: add docker hub login

.github/workflows/__shared-ci.yml

@@ -12,10 +12,21 @@ on:
         value: ${{ jobs.docker-build-images.outputs.built-images }}
 
 jobs:
+  init:
+    name: "prepare environment for jobs"
+    runs-on: self-hosted
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
 
   shellcheck:
     name: "Shell: Lint Shell Scripts"
     runs-on: self-hosted
+    needs:
+      - init
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -26,6 +37,8 @@ jobs:
   hadolint:
     name: "Docker: Lint Dockerfile"
     runs-on: self-hosted
+    needs:
+      - init
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -36,6 +49,7 @@ jobs:
   docker-build-images:
     name: "Docker: Build Images"
     needs:
+      - init
       - shellcheck
       - hadolint
     uses: hoverkraft-tech/ci-github-container/.github/workflows/[email protected]
@@ -68,6 +82,7 @@ jobs:
     name: "Helm: Chart Testing"
     runs-on: self-hosted
     needs:
+      - init
       - docker-build-images
     steps:
       - name: Checkout