SWI-4838 || Small update to README and installer (#4)

* Use right github url to download tarball

* installing latest version

* installing latest version

* update readme

README.md

@@ -27,7 +27,7 @@ To install vault-shim, download the installer from GitHub and execute it.
 ```shell
 curl -H 'Accept: application/vnd.github.v3.raw' -L -o vault-shim-installer.sh https://raw.githubusercontent.com/Bandwidth/vault-shim/<VERSION>/vault-shim-installer.sh
 chmod +x vault-shim-installer.sh
-./vault-shim-installer.sh
+./vault-shim-installer.sh "<VERSION>"
 
 vault-shim --help
 ```
@@ -85,8 +85,8 @@ Dockerfile
 FROM python:3.12 as vault-shim
 
 RUN curl -H 'Accept: application/vnd.github.v3.raw' -L -o vault-shim-installer.sh https://raw.githubusercontent.com/Bandwidth/vault-shim/<VERSION>/vault-shim-installer.sh
-RUN chmod +x "vault-shim-installer.sh"
-RUN ./vault-shim-installer.sh
+RUN chmod +x "vault-shim-installer.sh" 
+RUN ./vault-shim-installer.sh "<VERSION>"
 
 ########## Second Stage ##########
 FROM python:3.12
@@ -119,7 +119,7 @@ FROM python:3.12 as vault-shim
 
 RUN curl -H 'Accept: application/vnd.github.v3.raw' -L -o vault-shim-installer.sh https://raw.githubusercontent.com/Bandwidth/vault-shim/<VERSION>/vault-shim-installer.sh
 RUN chmod +x "vault-shim-installer.sh"
-RUN ./vault-shim-installer.sh
+RUN ./vault-shim-installer.sh "<VERSION>"
 
 ########## Second Stage ##########
 FROM example.jfrog.io/eclipse-temurin:19.0.2_7-jre

vault-shim-installer.sh

@@ -15,6 +15,6 @@ echo "os: $os"
 echo "arch: $arch"
 
 # purposefully leaving the filename on the tar so that we know which shim was downloaded if we ever have to shell in and diagnose an issue
-curl -H 'Accept: application/vnd.github.v3.raw' -L "https://github.com/Bandwidth/vault-shim/releases/download/v${version}/vault-shim-${version}.tar.gz" --output "/usr/local/bin/vault-shim_${os}_${arch}.tar.gz"
+curl -L "https://github.com/Bandwidth/vault-shim/tarball/v${version}" --output "/usr/local/bin/vault-shim_${os}_${arch}.tar.gz"
 
 tar xzf "/usr/local/bin/vault-shim_${os}_${arch}.tar.gz" -C "/usr/local/bin"