[steps] [ENG-14503] Don't wrap b64-encoded values on Linux (#491)

* [steps] Base64 encode set env vars

When using set-env command base64-encode the value of the env var before saving to a file

See: https://linear.app/expo/issue/ENG-14503/base64-encode-env-vars-in-custom-builds

* [steps] Base64 decode env vars

When collecting envs base64-decode them

See: https://linear.app/expo/issue/ENG-14503/base64-encode-env-vars-in-custom-builds

* [steps] Remove unused utils

Removed the env utils which are no longer used

See: https://linear.app/expo/issue/ENG-14503/base64-encode-env-vars-in-custom-builds

* [steps] Add encoding

Added explicit encoding when decoding from b64

See: https://linear.app/expo/issue/ENG-14503/base64-encode-env-vars-in-custom-builds

* [steps] Avoid line wraps on Linux

Linux systems add line wraps to b64 encoded values after 76 characters by default. We don't want that

See: https://linear.app/expo/issue/ENG-14503/base64-encode-env-vars-in-custom-builds

* [steps] Avoid line wraps on Linux

Linux systems add line wraps to b64 encoded values after 76 characters by default. We don't want that

See: https://linear.app/expo/issue/ENG-14503/base64-encode-env-vars-in-custom-builds

packages/steps/bin/set-env

@@ -20,4 +20,8 @@ if [[ "$NAME" == *"="* ]]; then
   exit 1
 fi
 
-echo -n "$VALUE" | base64 > $__EXPO_STEPS_ENVS_DIR/$NAME
+if [[ "$OSTYPE" == "linux"* ]]; then
+  echo -n "$VALUE" | base64 -w 0 > $__EXPO_STEPS_ENVS_DIR/$NAME
+else
+  echo -n "$VALUE" | base64 > $__EXPO_STEPS_ENVS_DIR/$NAME
+fi