Inject version when building and report version to Gitea via log and header (#43)

close #42
1. Inject runner version when `make build`
After building, executing command line: `./act_runner -v` or `./act_runner --version`, the version of runner is printed.
![image](/attachments/e25efbd3-79b3-49a5-b93f-42646d42c707)

2. In `Actions` UI:
![image](/attachments/36c57470-2a1d-4796-9eb0-de3988ab88e1)

3. Set request header in http client interceptor.

Co-authored-by: sillyguodong <gedong_1994@163.com>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/43
Reviewed-by: delvh <dev.lh@web.de>
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: sillyguodong <sillyguodong@noreply.gitea.io>
Co-committed-by: sillyguodong <sillyguodong@noreply.gitea.io>

.goreleaser.yaml

@@ -60,7 +60,7 @@ builds:
   flags:
   - -trimpath
   ldflags:
-  - -s -w
+  - -s -w -X gitea.com/gitea/act_runner/cmd.version={{ .Version }}
   binary: >-
     {{ .ProjectName }}-
     {{- if .IsSnapshot }}{{ .Branch }}-
@@ -93,4 +93,4 @@ snapshot:
 
 nightly:
   publish_release: false
-  name_template: "{{ .Branch }}"
+  name_template: "{{ .Branch }}"