Install man in the background

Also change staging area to /tmp/bash-config and add a do not modify note

Author: coretl

.devcontainer/features/bash-config/config/bash-config-rc

@@ -1,6 +1,8 @@
 #!/bin/bash
 
 # default opinioned bash configuration
+# DO NOT MODIFY if installed in /bash-config
+# this file will be overwritten on each container launch
 
 # enable enternal shared history
 export HISTCONTROL=ignoreboth:erasedups

.devcontainer/features/bash-config/config/postCreateCommand.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# this script is run once inside the developer container after creation time
+
+# Install man so we can do git <command> --help
+apt-get update && apt-get install -y --no-install-recommends man

.devcontainer/features/bash-config/devcontainer-feature.json

@@ -8,7 +8,7 @@
     "documentationURL": "https://raw.githubusercontent.com/DiamondLightSource/devcontainer-features/refs/heads/main/.devcontainer/features/bash-config/README.md",
     "containerEnv": {
         "CONFIG_FOLDER": "/bash-config",
-        "CONFIG_STAGING": "/bash-config-staging"
+        "CONFIG_STAGING": "/tmp/bash-config"
     },
     "mounts": [
         {
@@ -17,5 +17,6 @@
             "type": "bind"
         }
     ],
-    "onCreateCommand": "bash /bash-config-staging/onCreateCommand.sh"
+    "onCreateCommand": "bash /tmp/bash-config/onCreateCommand.sh",
+    "postCreateCommand": "bash /tmp/bash-config/postCreateCommand.sh"
 }

test/bash-config/test.sh

@@ -11,6 +11,7 @@ source dev-container-features-test-lib
 # The 'check' command comes from the dev-container-features-test-lib. Syntax is...
 # check <LABEL> <cmd> [args...]
 check "execute command" bash -c "test $HISTFILE == $CONFIG_FOLDER/.bash_eternal_history"
+check "man installed" man -V
 
 # Report results
 # If any of the checks above exited with a non-zero exit code, the test will fail.