fix: improve behaviour across masking, commands and status (#1194)

Fixes 51 bugs discovered via comparison with `actions/runner`. Every fix has test coverage.

### Secrets

- A short secret registered no shifted-base64 form, so `base64("user:$TOKEN")` printed in the clear
- Encoded forms came only from the whole trimmed value, missing padded and per-line spellings
- Masks split only on `\n`, so `::add-mask::a%0Db` registered neither half
- Adds XML, expression-string and quote-trimming encoders

### Workflow commands

- Split at the last `::` or `]` rather than the first, so `::add-mask::a::b` registered no mask
- A command on the last line without a newline was ignored, and `::ADD-MASK::` did nothing
- `##[...]` did not decode `%3B`/`%5D`, properties lost anything after a second `=`
- `$GITHUB_ENV` and `::set-env::` now refuse `NODE_OPTIONS`

### Status

- `continue-on-error` reported failed, a cancelled job reported success, an `if:` error reported cancelled
- File commands ran after `continue-on-error`, failing the job while the step stayed green
- A bad job output aborted the whole run instead of that job

### Steps and actions

- `${{ matrix.* }}` and `${{ strategy.* }}` were empty inside composite actions
- Composite inputs leaked into nested actions as `INPUT_*`, `with:` matched case-sensitively, `pre` failures were dropped
- Docker actions dropped `runs.env` when the caller passed `with: args:`, and caller `args`/`entrypoint` beat the manifest
- An implicit shell ran with `pipefail`, a `shell:` without `{0}` passed without running
- `container.env` overrode job env and every `$GITHUB_ENV` write, heredocs lost leading blank lines, `$GITHUB_PATH` was not BOM-decoded

Written by Claude Opus 5.

Reviewed-on: https://gitea.com/gitea/runner/pulls/1194
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

act/runner/step_action_remote_test.go

@@ -242,6 +242,23 @@ func TestStepActionRemote(t *testing.T) {
 			cm.AssertExpectations(t)
 		})
 	}
+
+	t.Run("refreshes composite inputs without leaking environment", func(t *testing.T) {
+		step := &stepActionRemote{
+			Step:         &model.Step{Uses: "org/composite@v1", With: map[string]string{"SHARED": "first"}},
+			RunContext:   &RunContext{Config: &Config{ActionCacheDir: t.TempDir()}, Run: &model.Run{JobID: "job", Workflow: &model.Workflow{Jobs: map[string]*model.Job{"job": {}}}}, JobContainer: &jobContainerMock{}},
+			action:       &model.Action{Inputs: map[string]model.Input{"shared": {}}},
+			env:          map[string]string{},
+			remoteAction: newRemoteAction("org/composite@v1"),
+		}
+
+		for _, value := range []string{"first", "second"} {
+			step.env["INPUT_SHARED"] = value
+			composite := step.getCompositeRunContext(t.Context())
+			assert.Equal(t, map[string]any{"shared": value}, composite.actionInputs)
+			assert.NotContains(t, composite.Env, "INPUT_SHARED")
+		}
+	})
 }
 
 func TestStepActionRemotePrepare(t *testing.T) {