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/job_hooks.go

@@ -51,10 +51,11 @@ func (rc *RunContext) runJobHook(ctx context.Context, hookPath, name string) err
 		rawLogger.Infof("shell: %s", shell)
 	}
 
-	env := maps.Clone(rc.GetEnv())
+	env := map[string]string{}
 	if jobContainer := rc.Run.Job().Container(); jobContainer != nil {
 		maps.Copy(env, jobContainer.Env)
 	}
+	maps.Copy(env, rc.GetEnv())
 	rc.withGithubEnv(ctx, rc.getGithubContext(ctx), env)
 	rc.ApplyExtraPath(ctx, &env)
 
@@ -95,10 +96,11 @@ func (rc *RunContext) setupHookFileCommands(ctx context.Context, env map[string]
 }
 
 func (rc *RunContext) processHookFileCommands(ctx context.Context) error {
-	if err := processRunnerEnvFileCommand(ctx, hookEnvFileCommand, rc, rc.setEnv); err != nil {
-		return err
+	err := processRunnerEnvFileCommand(ctx, hookEnvFileCommand, rc, rc.setEnvFile)
+	if pathErr := rc.UpdateExtraPath(ctx, path.Join(rc.JobContainer.GetActPath(), hookPathFileCommand)); pathErr != nil && err == nil {
+		err = pathErr
 	}
-	return rc.UpdateExtraPath(ctx, path.Join(rc.JobContainer.GetActPath(), hookPathFileCommand))
+	return err
 }
 
 // hookCommand mirrors actions/runner, which deliberately does not apply the shell flags it