Add initial installation script

.gitignore

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+bin/

cluster_issuer.yaml

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+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: letsencrypt-prod
+spec:
+  acme:
+    email: EMAIL_ADDRESS
+    server: https://acme-v02.api.letsencrypt.org/directory
+    privateKeySecretRef:
+      name: letsencrypt-prod-private-key
+    solvers:
+    - http01:
+        ingress:
+          class: nginx

install.sh

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+#!/usr/bin/bash
+
+EMAIL_ADDRESS="${EMAIL_ADDRESS:-kubernetesadmin@example.org}"
+KUBECTL_BIN="${KUBECTL_BIN:-kubectl}"
+INSTALL_DIR="${INSTALL_DIR:-$(pwd)/bin}"
+HELM_BIN="${INSTALL_DIR}/helm"
+ARGOCD_BIN="${INSTALL_DIR}/argocd"
+
+blue_color="\e[34m"
+reset_color="\e[0m"
+
+function log_info {
+	printf "%b%s%b\n" "${blue_color}" "${1}" "${reset_color}"
+}
+
+function install_helm {
+	curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 \
+		| USE_SUDO="false" HELM_INSTALL_DIR="${INSTALL_DIR}" bash
+}
+
+function install_nginx_ingress_controller {
+	${HELM_BIN} repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
+	${HELM_BIN} repo update
+	${HELM_BIN} install nginx-ingress ingress-nginx/ingress-nginx \
+		--set controller.publishService.enabled=true
+}
+
+function install_cert_manager {
+	${KUBECTL_BIN} create namespace cert-manager
+	${HELM_BIN} repo add jetstack https://charts.jetstack.io
+	${HELM_BIN} repo update
+	${HELM_BIN} install cert-manager jetstack/cert-manager \
+		--namespace cert-manager \
+		--version v1.2.0 \
+		--set installCRDs=true
+}
+
+function create_cluster_issuer {
+	sed "s/EMAIL_ADDRESS/${EMAIL_ADDRESS}/" cluster_issuer.yaml | ${KUBECTL_BIN} apply -f -
+}
+
+function install_argocd_full {
+	${KUBECTL_BIN} create namespace argocd
+	${KUBECTL_BIN} apply \
+		-n argocd \
+		-f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
+
+	curl -sSL -o "${ARGOCD_BIN}" https://github.com/argoproj/argo-cd/releases/latest/download/argocd-linux-amd64
+	chmod +x "${ARGOCD_BIN}"
+
+}
+
+function install_tekton {
+	${KUBECTL_BIN} apply \
+		-f https://storage.googleapis.com/tekton-releases/pipeline/latest/release.yaml
+}
+
+mkdir -pv "${INSTALL_DIR}"
+
+log_info "Installing Helm..."
+install_helm
+
+log_info "Installing NGINX ingress controller..."
+install_nginx_ingress_controller
+
+log_info "Installing cert manager..."
+install_cert_manager
+create_cluster_issuer
+
+log_info "Installing Argo CD..."
+install_argocd_full
+
+log_info "Installing Tekton..."
+install_tekton
+
+log_info "Installation completed successfuly!"