Output a helpful error message when no static.json is found (heroku#202)

The error message is now output to `stderr` otherwise it's not shown. Closes GUS-W-8799430. Refs heroku#198.
Airbase · Jun 21, 2021 · b40c445 · b40c445
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+* [#202](https://github.com/heroku/heroku-buildpack-static/pull/202) Output a helpful error message when no `static.json` is found
 
 ## v6 (2020-12-09)
 

diff --git a/bin/detect b/bin/detect
@@ -4,6 +4,7 @@
 build_dir=$1
 
 if [ ! -f "$build_dir/static.json" ]; then
+    echo "Could not find 'static.json'! Please ensure it exists and is checked into Git." >&2
     exit 1
 fi
Original file line number	Diff line number	Diff line change
Expand Up		@@ -2,6 +2,7 @@

		## Unreleased

		* [#202](https://github.com/heroku/heroku-buildpack-static/pull/202) Output a helpful error message when no `static.json` is found

		## v6 (2020-12-09)

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-Original file line number
+Diff line change
@@ Expand Up / @@ -4,6 +4,7 @@ @@
     build_dir=$1
     if [ ! -f "$build_dir/static.json" ]; then
+        echo "Could not find 'static.json'! Please ensure it exists and is checked into Git." >&2
         exit 1
     fi
@@ Expand Down @@