Update Oracle Database 23ai Free to 23.8.0

Oracle Database 23ai Free 23.8.0 has been released, so update the Vagrant project to reflect the new version number:

- Rename the project directory from 23.7.0-Free to 23.8.0-Free
- Update the version number in the .env and README.md files
- Update the SHA256 digest and filename for the installer rpm in db_installer.sha256
- Update the installer rpm filename in scripts/install.sh

Tested with both VirtualBox and libvirt providers.

Closes oracle#544

Signed-off-by: Paul Neumann <38871902+PaulNeumann@users.noreply.github.com>

Author: PaulNeumann

OracleDatabase/23.7.0-Free/db_installer.sha256

@@ -1,4 +1,4 @@
-# Oracle Database 23.7.0 Free configuration file
+# Oracle Database 23.8.0 Free configuration file
 #
 # Requires vagrant-env plugin
 #

OracleDatabase/23.7.0-Free/.env renamed to OracleDatabase/23.8.0-Free/.env

@@ -11,7 +11,7 @@ makes configuration much easier
 ## Getting started
 
 1. Clone this repository `git clone https://github.com/oracle/vagrant-projects`
-2. Change into the `vagrant-projects/OracleDatabase/23.7.0-Free` directory
+2. Change into the `vagrant-projects/OracleDatabase/23.8.0-Free` directory
 3. Run `vagrant up`
    1. The first time you run this it will provision everything and may take a while. Ensure you have a good internet connection as the scripts will update the VM to the latest via `dnf`.
    2. The installation can be customized, if desired (see [Configuration](#configuration)).

OracleDatabase/23.7.0-Free/.gitattributes renamed to OracleDatabase/23.8.0-Free/.gitattributes

@@ -0,0 +1 @@
+36dd7d1208ef212ebab672b2ddc42b7bcd08b07eeb5b7387dc0bcb3a4ef225a5 */vagrant/oracle-database-free-23ai-23.8-1.el9.x86_64.rpm

OracleDatabase/23.7.0-Free/.gitignore renamed to OracleDatabase/23.8.0-Free/.gitignore

@@ -18,7 +18,7 @@ echo 'INSTALLER: Started up'
 
 # if the database installer exists, set parameter to keep it
 # otherwise, download it
-db_installer='oracle-database-free-23ai-1.0-1.el9.x86_64.rpm'
+db_installer='oracle-database-free-23ai-23.8-1.el9.x86_64.rpm'
 
 if [[ -f /vagrant/"${db_installer}" ]]; then
   KEEP_DB_INSTALLER='true'