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>

internal/pkg/report/reporter_test.go

@@ -23,6 +23,7 @@ import (
 	"gitea.com/gitea/runner/internal/pkg/metrics"
 
 	connect_go "connectrpc.com/connect"
+	"gitea.dev/actionslib/pkg/model"
 	runnerv1 "gitea.dev/actionslib/runner/v1"
 	log "github.com/sirupsen/logrus"
 	logrustest "github.com/sirupsen/logrus/hooks/test"
@@ -273,14 +274,14 @@ func TestReporter_Fire(t *testing.T) {
 			"stepID":     []string{"0", "0"},
 			"stepNumber": 0,
 			"raw_output": true,
-			"stepResult": "failure",
+			"stepResult": model.StepStatusFailure,
 		}}))
 		assert.Equal(t, runnerv1.Result_RESULT_UNSPECIFIED, reporter.state.Steps[0].Result)
 		require.NoError(t, reporter.Fire(&log.Entry{Message: "step result", Data: map[string]any{
 			"stage":      "Main",
 			"stepNumber": 0,
 			"raw_output": true,
-			"stepResult": "success",
+			"stepResult": model.StepStatusSuccess,
 		}}))
 		assert.Equal(t, runnerv1.Result_RESULT_SUCCESS, reporter.state.Steps[0].Result)