fix: adjust docker and any file for starting project

Dockerfile.local

@@ -0,0 +1,20 @@
+FROM golang:1.23-alpine
+
+# Install dependensi dasar
+RUN apk add --no-cache git curl bash build-base
+
+# Install Air (pakai repo baru air-verse)
+RUN go install github.com/air-verse/air@v1.52.3
+
+WORKDIR /lti-api
+
+# Cache dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+EXPOSE 8080
+
+CMD ["air", "-c", ".air.toml"]