commiting initial github action pipeline

.github/workflows/docker-build.yml

@@ -0,0 +1,36 @@
+name: Build and Push Docker Image to GHCR
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '.github/workflows/docker-build.yml'
+      - 'docker/**'
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GHCR_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/tithia/basic:latest
+            ghcr.io/tithia/basic:${{ github.run_number }}

README.md

@@ -57,6 +57,14 @@ Below command uses the `--user` argument in order to define with which user will
 ansible-playbook -i ./infra/spark_inventory.ini --user tithia ./infra/spark.yml
 ```
 
+## Docker
+
+A specialized container image has been prepared in order to be used by JupyterHub. The relevant content is under the `docker` directory.
+
+```
+docker login -u angelosnm -p <token> ghcr.io
+```
+
 ## Kubernetes (K3s)
 
 #### Download and install the K3s Kubernetes distribution (a lightweight Kubernetes installer for single-node or cluster setups).
@@ -105,6 +113,14 @@ sudo cat /var/lib/rancher/k3s/server/node-token
 curl -sfL https://get.k3s.io | K3S_URL=https://<master-ip>:6443 K3S_TOKEN=<node-token> sh -
 ```
 
+#### Taint control plane node to prevent pods scheduling
+```
+kubectl taint nodes tithia-kube-control-plane node-role.kubernetes.io/control-plane:NoSchedule
+```
+
+
+
+
 ### Metrics-server
 ```
 kubectl apply -f ./kube/metrics-server/metrics-server.yaml