Add tenv linter (#1322)

Tenv is analyzer that detects using `os.Setenv` instead of `t.Setenv` since Go 1.17.

.golangci.yaml

@@ -19,6 +19,12 @@ linters-settings:
     enable:
       - nilness
 
+  tenv:
+    # The option `all` will run against whole test files (`_test.go`) regardless of method/function signatures.
+    # Otherwise, only methods that take `*testing.T`, `*testing.B`, and `testing.TB` as arguments are checked.
+    # Default: false
+    all: true
+
 linters:
   disable-all: true
   enable:
@@ -28,6 +34,7 @@ linters:
     - govet # reports suspicious constructs, such as Printf calls whose arguments do not align with the format string
     - ineffassign # detects when assignments to existing variables are not used
     - staticcheck # is a go vet on steroids, applying a ton of static analysis checks
+    - tenv # Tenv is analyzer that detects using os.Setenv instead of t.Setenv since Go1.17.
     - typecheck # like the front-end of a Go compiler, parses and type-checks Go code
     - unused # checks for unused constants, variables, functions and types
     ## disable by default but the have interesting results so lets add them