feat: add misc/install.sh oneline install script (#4284)

Allows `curl -sSL
https://raw.githubusercontent.com/gnolang/gno/main/misc/install.sh |
bash`.

Currently, it already supports the `--uninstall` flag, which means we
can expect to add more options, such as `--with-gnoland`, for additional
binaries, etc.

This is optional for some binaries where a simple `go install
github.com/gnolang/gno/gnovm/cmd/gno@latest` works out of the box.
However, it is necessary when the go.mod file contains `replace`
directives, such as `gnodev`.



Blocks gnolang/getting-started#2

---------

Signed-off-by: moul <94029+moul@users.noreply.github.com>
Co-authored-by: aeddi <antoine.e.b@gmail.com>

Author: moul

misc/install.sh

@@ -0,0 +1,133 @@
+#!/bin/bash
+set -e
+
+# Usage: curl -sSL https://raw.githubusercontent.com/gnolang/gno/main/misc/install.sh | bash
+# Optional: GNO_DIR=/custom/path curl -sSL https://raw.githubusercontent.com/gnolang/gno/main/misc/install.sh | bash
+# Uninstall: curl -sSL https://raw.githubusercontent.com/gnolang/gno/main/misc/install.sh | bash -s -- --uninstall
+#
+# This script is temporarily located in misc/ as we expect more official installation
+# methods to emerge. It provides a convenient one-liner for installing gno, which is
+# particularly useful when working with go.mod files containing replace directives
+# that might conflict with direct `go install` commands.
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Function to print colored messages
+log() {
+    echo -e "${GREEN}[gno-install]${NC} $1"
+}
+
+error() {
+    echo -e "${RED}[gno-install]${NC} $1" >&2
+}
+
+warn() {
+    echo -e "${YELLOW}[gno-install]${NC} $1"
+}
+
+# Function to check if a command exists
+command_exists() {
+    command -v "$1" >/dev/null 2>&1
+}
+
+# Function to determine gno source directory
+get_gno_dir() {
+    if [ -n "$GNO_DIR" ]; then
+        echo "$GNO_DIR"
+    elif [ -n "$HOME" ]; then
+        echo "$HOME/.gno/src"
+    else
+        echo "/usr/local/share/gno"
+    fi
+}
+
+# Function to check Go installation
+check_go() {
+    if ! command_exists go; then
+        error "Go is not installed. Please install Go first:"
+        echo "  https://golang.org/doc/install"
+        exit 1
+    fi
+
+    # Check Go version
+    GO_VERSION=$(go version | awk '{print $3}' | sed 's/go//')
+    if [ "$(echo "$GO_VERSION 1.18" | awk '{print ($1 < $2)}')" -eq 1 ]; then
+        error "Go version 1.18 or higher is required. Current version: $GO_VERSION"
+        exit 1
+    fi
+}
+
+# Function to install gno
+install_gno() {
+    local GNO_DIR
+    GNO_DIR=$(get_gno_dir)
+
+    if ! command_exists git; then
+      error "git is not installed. Please install git first."
+      exit 1
+    fi
+
+    log "Installing gno source to $GNO_DIR"
+
+    mkdir -p "$GNO_DIR"
+    # Clone or update repository
+    if [ -d "$GNO_DIR/.git" ]; then
+        log "Updating existing gno repository..."
+        cd "$GNO_DIR"
+        git fetch --depth 1
+        git reset --hard origin/master
+    else
+        log "Cloning gno repository..."
+        git clone --depth 1 https://github.com/gnolang/gno.git "$GNO_DIR"
+        cd "$GNO_DIR"
+    fi
+
+    # Build and install
+    log "Building gno..."
+    make install
+
+    # Verify installation
+    if ! command_exists gno; then
+        error "Installation failed. gno command not found."
+        log "Is $GOBIN set in your $PATH? See https://go.dev/doc/install/source#environment"
+        exit 1
+    fi
+
+    log "Installation successful! gno is now available."
+    gno version
+}
+
+# Function to uninstall gno
+uninstall_gno() {
+    local GNO_DIR
+    local GOPATH
+    GNO_DIR=$(get_gno_dir)
+    GOPATH=$(go env GOPATH)
+
+    log "Uninstalling gno binaries from $GOPATH/bin"
+    rm -f "$GOPATH/bin/gno"
+    rm -f "$GOPATH/bin/gnokey"
+    rm -f "$GOPATH/bin/gnodev"
+
+    # Remove source directory
+    log "Removing gno source from $GNO_DIR"
+    rm -rf "$GNO_DIR"
+
+    log "Uninstallation complete."
+}
+
+# Main script
+if [ "$1" = "--uninstall" ]; then
+    uninstall_gno
+    exit 0
+fi
+
+# Check Go installation
+check_go
+
+# Install gno
+install_gno