Restore travis config

Signed-off-by: Piotr Piotrowski <piotr@synadia.com>

.travis.yml

@@ -0,0 +1,36 @@
+language: go
+go:
+- "1.22.x"
+- "1.21.x"
+go_import_path: github.com/nats-io/nats.go
+install:
+- go get -t ./...
+- curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin
+- if [[ "$TRAVIS_GO_VERSION" =~ 1.22 ]]; then
+    go install github.com/mattn/goveralls@latest;
+    go install github.com/wadey/gocovmerge@latest;
+    go install honnef.co/go/tools/cmd/staticcheck@latest;
+    go install github.com/client9/misspell/cmd/misspell@latest;
+  fi
+before_script:
+- $(exit $(go fmt ./... | wc -l))
+- go vet -modfile=go_test.mod ./...
+- if [[ "$TRAVIS_GO_VERSION" =~ 1.22 ]]; then
+    find . -type f -name "*.go" | xargs misspell -error -locale US;
+    GOFLAGS="-mod=mod -modfile=go_test.mod" staticcheck ./...;
+  fi
+- golangci-lint run ./jetstream/...
+script:
+- go test -modfile=go_test.mod -v -run=TestNoRace -p=1 ./... --failfast -vet=off
+- if [[ "$TRAVIS_GO_VERSION" =~ 1.22 ]]; then ./scripts/cov.sh TRAVIS; else go test -modfile=go_test.mod -race -v -p=1 ./... --failfast -vet=off -tags=internal_testing; fi
+after_success:
+- if [[ "$TRAVIS_GO_VERSION" =~ 1.22 ]]; then $HOME/gopath/bin/goveralls -coverprofile=acc.out -service travis-ci; fi
+
+jobs:
+  include:
+  - name: "Go: 1.22.x (nats-server@main)"
+    go: "1.22.x"
+    before_script:
+    - go get -modfile go_test.mod github.com/nats-io/nats-server/v2@main
+  allow_failures:
+  - name: "Go: 1.22.x (nats-server@main)"