stdlib: implemented kubernetes/helm

Signed-off-by: Sam Alba <sam.alba@gmail.com>

stdlib/kubernetes/helm/code.cue

@@ -0,0 +1,47 @@
+package helm
+
+#code: #"""
+    # Install Helm
+    curl -sfL -S https://get.helm.sh/helm-v${HELM_VERSION}-linux-amd64.tar.gz | \
+        tar -zx -C /tmp && \
+        mv /tmp/linux-amd64/helm /usr/local/bin && \
+        chmod +x /usr/local/bin/helm
+
+    # Add the repository
+    helm repo add repository "${HELM_REPO}"
+    helm repo update
+
+    # If the chart is a file, then it's the chart name
+    # If it's a directly, then it's the contents of the cart
+    if [ -f "/helm/chart" ]; then
+        HELM_CHART="repository/$(cat /helm/chart)"
+    else
+        HELM_CHART="/helm/chart"
+    fi
+
+    OPTS=""
+    OPTS="$OPTS --timeout "$HELM_TIMEOUT""
+    OPTS="$OPTS --namespace "$KUBE_NAMESPACE""
+    [ "$HELM_WAIT" = "true" ] && OPTS="$OPTS --wait"
+    [ "$HELM_ATOMIC" = "true" ] && OPTS="$OPTS --atomic"
+    [ -f "/helm/values.yaml" ] && OPTS="$OPTS -f /helm/values.yaml"
+
+    # Select the namespace
+    kubectl create namespace "$KUBE_NAMESPACE" || true
+
+    case "$HELM_ACTION" in
+        install)
+            helm install $OPTS "$HELM_NAME" "$HELM_CHART"
+        ;;
+        upgrade)
+            helm upgrade $OPTS "$HELM_NAME" "$HELM_CHART"
+        ;;
+        installOrUpgrade)
+            helm upgrade $OPTS --install "$HELM_NAME" "$HELM_CHART"
+        ;;
+        *)
+            echo unsupported helm action "$HELM_ACTION"
+            exit 1
+        ;;
+    esac
+    """#