feat: install Ollama prerequisites during plugin install

scripts/install_ollama.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+# Install Ollama and its Linux prerequisites for Hermes-Ollama_Models.
+set -Eeuo pipefail
+
+if [[ "$(uname -s)" != "Linux" ]]; then
+  printf '%s\n' 'Automatic Ollama installation is currently supported on Linux only.' >&2
+  exit 1
+fi
+
+if command -v ollama >/dev/null 2>&1; then
+  ollama --version >/dev/null
+  exit 0
+fi
+
+run_privileged() {
+  if [[ "${EUID}" -eq 0 ]]; then
+    "$@"
+  elif command -v sudo >/dev/null 2>&1 && sudo -n true >/dev/null 2>&1; then
+    sudo -n "$@"
+  else
+    printf '%s\n' 'Ollama installation needs root or passwordless sudo.' >&2
+    exit 1
+  fi
+}
+
+if ! command -v curl >/dev/null 2>&1; then
+  if command -v apt-get >/dev/null 2>&1; then
+    run_privileged apt-get update
+    run_privileged apt-get install -y curl ca-certificates
+  elif command -v dnf >/dev/null 2>&1; then
+    run_privileged dnf install -y curl ca-certificates
+  elif command -v yum >/dev/null 2>&1; then
+    run_privileged yum install -y curl ca-certificates
+  elif command -v pacman >/dev/null 2>&1; then
+    run_privileged pacman -Sy --noconfirm curl ca-certificates
+  else
+    printf '%s\n' 'Could not find a supported package manager to install curl and ca-certificates.' >&2
+    exit 1
+  fi
+fi
+
+installer="$(mktemp)"
+trap 'rm -f "$installer"' EXIT
+curl --fail --silent --show-error --location https://ollama.com/install.sh --output "$installer"
+run_privileged sh "$installer"
+
+command -v ollama >/dev/null 2>&1
+ollama --version >/dev/null