add actions for deployment to EKS cluster

.github/eks/aws-cli/action.yaml

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+name: update aws cli
+description: update AWS CLI
+runs:
+  using: composite
+  steps:
+    - run: |
+        curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" && unzip awscliv2.zip && sudo ./aws/install --update
+        curl --silent --location "https://github.com/weaveworks/eksctl/releases/latest/download/eksctl_$(uname -s)_amd64.tar.gz" | tar xz -C /tmp
+        sudo mv /tmp/eksctl /usr/local/bin

.github/eks/deploy-helm/action.yaml

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+name: deploy helm
+description: deploy the helm chart
+inputs:
+    release-name:
+        description: name of the release
+        required: true
+    namespace:
+        description: deployment's namespace 
+        required: true
+    chart-name:
+        description: the helm chart's name
+        required: true
+    org-name:
+        description: the organisation name
+        required: true
+    repo-url:
+        description: the helm chart's URL
+        required: true
+    target-port:
+        description: port where the service runs on
+        required: true
+    values-file-path:
+        description: path of the helm chart values file
+        required: true
+runs:
+  using: composite
+  steps:
+    - run: |
+        helm repo add ${{ inputs.org-name }} ${{ inputs.repo-url }}
+        helm repo update
+        helm upgrade --install ${{ inputs.release-name }} ${{ inputs.chart-name }} \
+            --set service.targetPort=${{ inputs.target-port }} \
+            --values ${{ inputs.values-file-path }} \
+            --atomic --namespace ${{ inputs.namespace }}

.github/eks/eksctl/action.yaml

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+name: install eksctl
+description: install eksctl
+runs:
+  using: composite
+  steps:
+    - run: |
+        curl --silent --location "https://github.com/weaveworks/eksctl/releases/latest/download/eksctl_$(uname -s)_amd64.tar.gz" | tar xz -C /tmp
+        sudo mv /tmp/eksctl /usr/local/bin

.github/eks/extract-image-tag/action.yaml

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+name: extract image tag
+description: extract and edit image tag into helm values file
+inputs:
+  values_file_path:
+    description: Path of the helm values file
+    required: true
+  image_tag:
+    description: Tag of the built image
+    required: true
+runs:
+  using: composite
+  steps:
+    - run: |
+        image_tag="${{ inputs.image_tag##*: }}"
+        echo $image_tag
+        sed -i "s|image-tag|${{ inputs.image_tag }}|g" "${{ inputs.values_file_path }}" 

.github/eks/setup-helm/action.yaml

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+name: setup helm
+description: install and setup Helm
+runs:
+  using: composite
+  steps:
+    - name: Install helm-s3 plugin
+      run: |
+        helm plugin install https://github.com/hypnoglow/helm-s3.git
+
+    - name: Set up Helm
+      run: |
+        curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
+        chmod 700 get_helm.sh
+        ./get_helm.sh

.github/eks/setup-iam/action.yaml

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+name: Setup IAM
+description: set up IAM identity mapping for EKS
+inputs:
+  cluster:
+    description: EKS cluster name
+    required: true
+  region:
+    description: AWS region
+    required: true
+  arn:
+    description: IAM ARN
+    required: true
+  username:
+    description: Username for the IAM identity
+    required: true
+runs:
+  using: composite
+  steps:
+    - run: |
+        aws sts get-caller-identity
+        eksctl create iamidentitymapping \
+          --cluster ${{ inputs.cluster }} \
+          --region ${{ inputs.region }} \
+          --arn ${{ inputs.arn }} \
+          --group system:masters \
+          --no-duplicate-arns \
+          --username ${{ inputs.username }}

.github/eks/update-kubeconfig/action.yaml

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+name: update kubeconfig
+description: update kubeconfig file to include new user ARN
+inputs:
+  cluster:
+    description: EKS cluster name
+    required: true
+  region:
+    description: AWS region
+    required: true
+runs:
+  using: composite
+  steps:
+    - run: |
+        aws eks update-kubeconfig --name ${{ inputs.cluster }} --region ${{ inputs.region }}