Add self-test workflow

tests/check-binary.sh

@@ -0,0 +1,26 @@
+set -e
+set -x
+
+TARGET=$1
+EXPECT_CROSS=$2
+EXPECT_FILE_RE=$3
+
+if [ "$EXPECT_CROSS" == "true" ]; then
+    if [ ! -f "$RUNNER_TEMP/cross" ]; then
+        echo "Could not find cross in path: $PATH"
+        exit 1
+    fi
+else
+    if [ -f "$RUNNER_TEMP/cross" ]; then
+        echo "Found cross in path: $PATH"
+        exit 1
+    fi
+fi
+
+FILE=$(file --brief ./target/$TARGET/debug/test-project)
+if [[ "$FILE" =~ $EXPECT_FILE_RE ]]; then
+    echo "file output matches $EXPECT_FILE_RE"
+else
+    echo "file output does not match $EXPECT_FILE_RE"
+    exit 2
+fi