upgrade deps; rewrite smtp session

vendor/github.com/getsentry/sentry-go/Makefile

@@ -0,0 +1,83 @@
+.DEFAULT_GOAL := help
+
+MKFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
+MKFILE_DIR := $(dir $(MKFILE_PATH))
+ALL_GO_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | sort)
+GO = go
+TIMEOUT = 300
+
+# Parse Makefile and display the help
+help: ## Show help
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+.PHONY: help
+
+build: ## Build everything
+	for dir in $(ALL_GO_MOD_DIRS); do \
+		cd "$${dir}"; \
+		echo ">>> Running 'go build' for module: $${dir}"; \
+		go build ./...; \
+	done;
+.PHONY: build
+
+### Tests (inspired by https://github.com/open-telemetry/opentelemetry-go/blob/main/Makefile)
+TEST_TARGETS := test-short test-verbose test-race
+test-race:    ARGS=-race
+test-short:   ARGS=-short
+test-verbose: ARGS=-v -race
+$(TEST_TARGETS): test
+test: $(ALL_GO_MOD_DIRS:%=test/%)  ## Run tests
+test/%: DIR=$*
+test/%:
+	@echo ">>> Running tests for module: $(DIR)"
+	@# We use '-count=1' to disable test caching.
+	(cd $(DIR) && $(GO) test -count=1 -timeout $(TIMEOUT)s $(ARGS) ./...)
+.PHONY: $(TEST_TARGETS) test
+
+# Coverage
+COVERAGE_MODE    = atomic
+COVERAGE_PROFILE = coverage.out
+COVERAGE_REPORT_DIR = .coverage
+COVERAGE_REPORT_DIR_ABS = "$(MKFILE_DIR)/$(COVERAGE_REPORT_DIR)"
+$(COVERAGE_REPORT_DIR):
+	mkdir -p $(COVERAGE_REPORT_DIR)
+clean-report-dir: $(COVERAGE_REPORT_DIR)
+	test $(COVERAGE_REPORT_DIR) && rm -f $(COVERAGE_REPORT_DIR)/*
+test-coverage: $(COVERAGE_REPORT_DIR) clean-report-dir  ## Test with coverage enabled
+	set -e ; \
+	for dir in $(ALL_GO_MOD_DIRS); do \
+	  echo ">>> Running tests with coverage for module: $${dir}"; \
+	  DIR_ABS=$$(python -c 'import os, sys; print(os.path.realpath(sys.argv[1]))' $${dir}) ; \
+	  REPORT_NAME=$$(basename $${DIR_ABS}); \
+	  (cd "$${dir}" && \
+	    $(GO) test -count=1 -timeout $(TIMEOUT)s -coverpkg=./... -covermode=$(COVERAGE_MODE) -coverprofile="$(COVERAGE_PROFILE)" ./... && \
+		cp $(COVERAGE_PROFILE) "$(COVERAGE_REPORT_DIR_ABS)/$${REPORT_NAME}_$(COVERAGE_PROFILE)" && \
+	    $(GO) tool cover -html=$(COVERAGE_PROFILE) -o coverage.html); \
+	done;
+.PHONY: test-coverage clean-report-dir
+
+mod-tidy: ## Check go.mod tidiness
+	set -e ; \
+	for dir in $(ALL_GO_MOD_DIRS); do \
+		cd "$${dir}"; \
+		echo ">>> Running 'go mod tidy' for module: $${dir}"; \
+		go mod tidy -go=1.18 -compat=1.18; \
+	done; \
+	git diff --exit-code;
+.PHONY: mod-tidy
+
+vet: ## Run "go vet"
+	set -e ; \
+	for dir in $(ALL_GO_MOD_DIRS); do \
+		cd "$${dir}"; \
+		echo ">>> Running 'go vet' for module: $${dir}"; \
+		go vet ./...; \
+	done;
+.PHONY: vet
+
+lint: ## Lint (using "golangci-lint")
+	golangci-lint run
+.PHONY: lint
+
+fmt: ## Format all Go files
+	gofmt -l -w -s .
+.PHONY: fmt