Speed up make examples (#403)

The previous version was building the pgroll command before every
example run. Instead, build the command once at the beginning and remove
it at the end.

Author: ryanslade

.github/workflows/build.yml

@@ -158,12 +158,7 @@ jobs:
           psql -h $POSTGRES_HOST -p $POSTGRES_PORT -U postgres -c "CREATE SCHEMA $PGROLL_SCHEMA;"
         fi
 
-        go run . init
-        for file in ./examples/*.json; do
-          if [ -f "$file" ]; then
-            go run . start --complete $file;
-          fi
-        done
+        make examples
       env:
         POSTGRES_PORT: 5432
         POSTGRES_HOST: localhost

Makefile

@@ -18,12 +18,14 @@ lint:
 	golangci-lint --config=.golangci.yml run
 
 examples:
-	@go run . init
+	@go build
+	@./pgroll init
 	@for file in examples/*.json; do \
 	    if [ -f $$file ]; then \
-	        go run . start --complete $$file; \
+	        ./pgroll start --complete $$file; \
 	    fi \
 	done
+	@go clean
 
 test:
 	go test ./...