Makefile for testing all go modules (#336)

`test` -> `test-fast`
`test-fast` -> `POSTGRES_CONTAINER=0`
`test-full` -> `POSTGRES_CONTAINER=1`

The command iterates through all our top level directories and checks if
there is a go module inside. If so it runs `go test ./...`

Adjusted test-without-docker workflow as well to use this.

Author: SoWieMarkus

.github/workflows/test.yaml

@@ -22,25 +22,7 @@ jobs:
         with:
           go-version-file: 'lib/go.mod'
       - name: Test quickly without Docker
-        run: |
-          echo "Testing lib module..."
-          cd lib && go test -v ./...
-          echo "Testing reservations module..."
-          cd ../reservations && go test -v ./...
-          echo "Testing machines module..."
-          cd ../machines && go test -v ./...
-          echo "Testing decisions module..."
-          cd ../decisions && go test -v ./...
-          echo "Testing scheduler module..."
-          cd ../scheduler && go test -v ./...
-          echo "Testing descheduler module..."
-          cd ../descheduler && go test -v ./...
-          echo "Testing extractor module..."
-          cd ../extractor && go test -v ./...
-          echo "Testing kpis module..."
-          cd ../kpis && go test -v ./...
-          echo "Testing sync module..."
-          cd ../sync && go test -v ./...
+        run: make test-fast
 
   test-with-docker:
     # We don't need to run this longer test if the previous one already failed.

Makefile

@@ -0,0 +1,25 @@
+# Declare test targets as phony targets (not file names)
+.PHONY: test test-fast test-full
+
+# Default test command - runs without Docker (fast)
+test: test-fast
+
+# Run tests without Docker/PostgreSQL container (faster, but some tests may be skipped)
+test-fast:
+	@echo "Running tests without PostgreSQL container..."
+	@for dir in */; do \
+		if [ -f "$$dir/go.mod" ]; then \
+			echo "Testing in $$dir..."; \
+			cd "$$dir" && POSTGRES_CONTAINER=0 go test ./... && cd ..; \
+		fi; \
+	done
+
+# Run tests with Docker/PostgreSQL container (slower, but runs all tests)
+test-full:
+	@echo "Running tests with PostgreSQL container..."
+	@for dir in */; do \
+		if [ -f "$$dir/go.mod" ]; then \
+			echo "Testing in $$dir..."; \
+			cd "$$dir" && POSTGRES_CONTAINER=1 go test ./... && cd ..; \
+		fi; \
+	done