Add curl to install instructions

Signed-off-by: Evan Lezar <[email protected]>

Author: elezar

container-toolkit/install-guide.md

@@ -31,6 +31,12 @@ where `systemd` cgroup drivers are used that cause containers to lose access to
    ```{note}
    These instructions [should work](./supported-platforms.md) for any Debian-derived distribution.
    ```
+1. Install the prerequisites for the instructions below:
+   ```console
+   $ sudo apt-get update && apt-get install -y --no-install-recommends \
+      curl \
+      gnupg2
+   ```
 
 1. Configure the production repository:
 
@@ -78,6 +84,12 @@ where `systemd` cgroup drivers are used that cause containers to lose access to
    These instructions [should work](./supported-platforms.md) for many RPM-based distributions.
    ```
 
+1. Install the prerequisites for the instructions below:
+   ```console
+   $ sudo dnf install -y \
+      curl
+   ```
+
 1. Configure the production repository:
 
    ```console