chore: clean up nolint directives in act package (#864)

Removes 88 `nolint` directives (386 → 298) via mechanical, zero-regression cleanups:

- **38 `bodyclose`** in `act/artifactcache/handler_test.go`: replaced by `defer resp.Body.Close()` after each HTTP call.
- **21 dead directives** (`gocyclo`, `dogsled`, `contextcheck`): none of these linters are enabled in `.golangci.yml`, so the directives were doing nothing.
- **29 `testifylint`** directives whose underlying issues were addressed by mechanical rewrites:
  - `assert.Nil(t, err)` → `assert.NoError(t, err)`
  - `assert.NotNil(t, err)` → `assert.Error(t, err)`
  - `assert.Equal(t, true/false, x)` → `assert.True/False(t, x)`
  - `assert.Equal(t, 0, len(x))` → `assert.Empty(t, x)`
  - `assert.Equal(t, N, len(x))` → `assert.Len(t, x, N)`
  - `assert.Len(t, x, 0)` → `assert.Empty(t, x)`

Many `testifylint` directives still apply because they flag `require-error` (i.e. testifylint wants `require.NoError` instead of `assert.NoError` for early bail-out). That's a behavior change (fail-fast vs continue) and out of scope for this purely mechanical cleanup — those can be addressed in a follow-up. Same for `expected-actual`, `equal-values`, `error-is-as`, and the remaining `nilnil` / `unparam` / `forbidigo` / `staticcheck` / `goheader` / `dupl` directives.

`golangci-lint run` is clean. Tests pass for all touched packages.

---
This PR was written with the help of Claude Opus 4.7

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/864
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <2021+silverwind@noreply.gitea.com>
Co-committed-by: silverwind <2021+silverwind@noreply.gitea.com>

act/container/docker_socket_test.go

@@ -29,7 +29,7 @@ func TestGetSocketAndHostWithSocket(t *testing.T) {
 	ret, err := GetSocketAndHost(socketURI)
 
 	// Assert
-	assert.Nil(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, SocketAndHost{socketURI, dockerHost}, ret)
 }
 
@@ -42,7 +42,7 @@ func TestGetSocketAndHostNoSocket(t *testing.T) {
 	ret, err := GetSocketAndHost("")
 
 	// Assert
-	assert.Nil(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, SocketAndHost{dockerHost, dockerHost}, ret)
 }
 
@@ -57,8 +57,8 @@ func TestGetSocketAndHostOnlySocket(t *testing.T) {
 	ret, err := GetSocketAndHost(socketURI)
 
 	// Assert
-	assert.NoError(t, err, "Expected no error from GetSocketAndHost")            //nolint:testifylint // pre-existing issue from nektos/act
-	assert.Equal(t, true, defaultSocketFound, "Expected to find default socket") //nolint:testifylint // pre-existing issue from nektos/act
+	assert.NoError(t, err, "Expected no error from GetSocketAndHost") //nolint:testifylint // pre-existing issue from nektos/act
+	assert.True(t, defaultSocketFound, "Expected to find default socket")
 	assert.Equal(t, socketURI, ret.Socket, "Expected socket to match common location")
 	assert.Equal(t, defaultSocket, ret.Host, "Expected ret.Host to match default socket location")
 }
@@ -73,7 +73,7 @@ func TestGetSocketAndHostDontMount(t *testing.T) {
 	ret, err := GetSocketAndHost("-")
 
 	// Assert
-	assert.Nil(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, SocketAndHost{"-", dockerHost}, ret)
 }
 
@@ -87,8 +87,8 @@ func TestGetSocketAndHostNoHostNoSocket(t *testing.T) {
 	ret, err := GetSocketAndHost("")
 
 	// Assert
-	assert.Equal(t, true, found, "Expected a default socket to be found") //nolint:testifylint // pre-existing issue from nektos/act
-	assert.Nil(t, err, "Expected no error from GetSocketAndHost")         //nolint:testifylint // pre-existing issue from nektos/act
+	assert.True(t, found, "Expected a default socket to be found")
+	assert.NoError(t, err, "Expected no error from GetSocketAndHost") //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, SocketAndHost{defaultSocket, defaultSocket}, ret, "Expected to match default socket location")
 }
 
@@ -112,8 +112,8 @@ func TestGetSocketAndHostNoHostNoSocketDefaultLocation(t *testing.T) {
 
 	// Assert
 	assert.Equal(t, unixSocket, defaultSocket, "Expected default socket to match common socket location")
-	assert.Equal(t, true, found, "Expected default socket to be found") //nolint:testifylint // pre-existing issue from nektos/act
-	assert.Nil(t, err, "Expected no error from GetSocketAndHost")       //nolint:testifylint // pre-existing issue from nektos/act
+	assert.True(t, found, "Expected default socket to be found")
+	assert.NoError(t, err, "Expected no error from GetSocketAndHost") //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, SocketAndHost{unixSocket, unixSocket}, ret, "Expected to match default socket location")
 }
 
@@ -128,7 +128,7 @@ func TestGetSocketAndHostNoHostInvalidSocket(t *testing.T) {
 	ret, err := GetSocketAndHost(mySocket)
 
 	// Assert
-	assert.Equal(t, false, found, "Expected no default socket to be found")      //nolint:testifylint // pre-existing issue from nektos/act
+	assert.False(t, found, "Expected no default socket to be found")
 	assert.Equal(t, "", defaultSocket, "Expected no default socket to be found") //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, SocketAndHost{}, ret, "Expected to match default socket location")
 	assert.Error(t, err, "Expected an error in invalid state")
@@ -147,8 +147,8 @@ func TestGetSocketAndHostOnlySocketValidButUnusualLocation(t *testing.T) {
 	// Assert
 	// Default socket locations
 	assert.Equal(t, "", defaultSocket, "Expect default socket location to be empty") //nolint:testifylint // pre-existing issue from nektos/act
-	assert.Equal(t, false, found, "Expected no default socket to be found")          //nolint:testifylint // pre-existing issue from nektos/act
+	assert.False(t, found, "Expected no default socket to be found")
 	// Sane default
-	assert.Nil(t, err, "Expect no error from GetSocketAndHost") //nolint:testifylint // pre-existing issue from nektos/act
+	assert.NoError(t, err, "Expect no error from GetSocketAndHost") //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, socketURI, ret.Host, "Expect host to default to unusual socket")
 }