feat(ci/cd): add cache

.drone.yml

@@ -25,6 +25,8 @@ steps:
     image: golang:1.19
     environment:
       TESTS_DB_DSN: postgres://postgres:dcbot@database:5432/dcbot?sslmode=disable
+      GOMODCACHE: /drone/src/.cache/test/go-mod
+      GOCACHE: /drone/src/.cache/test/go-build
     commands:
       - make generate
       - go test -race -coverprofile=coverage.txt -covermode=atomic ./...
@@ -85,6 +87,9 @@ steps:
         - .cache/gomod/go-build
   - name: check go.mod
     image: golang:1.19
+    environment:
+      GOMODCACHE: /drone/src/.cache/gomod/go-mod
+      GOCACHE: /drone/src/.cache/gomod/go-build
     commands:
       - make generate
       - go mod tidy
@@ -140,6 +145,10 @@ steps:
         - .cache/lint/golangci-lint
   - name: run golangci-lint
     image: golangci/golangci-lint:v1.50
+    environment:
+      GOMODCACHE: /drone/src/.cache/lint/go-mod
+      GOCACHE: /drone/src/.cache/lint/go-build
+      GOLANGCI_LINT_CACHE: /drone/src/.cache/lint/golangci-lint
     commands:
       - make generate
       - golangci-lint run