Fix getting commit SHA in CI

.gitlab-ci.yml

@@ -14,7 +14,7 @@ stages:
   - apk add build-base olm-dev@edge_community
   - mkdir -p .cache
   - export GOPATH="$CI_PROJECT_DIR/.cache"
-  - export GO_LDFLAGS="-X main.Tag=$CI_COMMIT_TAG -X main.Commit=$CI_COMMIT_REF_NAME -X 'main.BuildTime=`date '+%b %_d %Y, %H:%M:%S'`'"
+  - export GO_LDFLAGS="-X main.Tag=$CI_COMMIT_TAG -X main.Commit=$CI_COMMIT_SHA -X 'main.BuildTime=`date '+%b %_d %Y, %H:%M:%S'`'"
   script:
   - go build -ldflags "$GO_LDFLAGS" -o mautrix-whatsapp
   artifacts:
@@ -44,7 +44,7 @@ build static:
   before_script:
   - mkdir -p .cache
   - export GOPATH="$CI_PROJECT_DIR/.cache"
-  - export GO_LDFLAGS="-X main.Tag=$CI_COMMIT_TAG -X main.Commit=$CI_COMMIT_REF_NAME -X 'main.BuildTime=`date '+%b %_d %Y, %H:%M:%S'`'"
+  - export GO_LDFLAGS="-X main.Tag=$CI_COMMIT_TAG -X main.Commit=$CI_COMMIT_SHA -X 'main.BuildTime=`date '+%b %_d %Y, %H:%M:%S'`'"
   variables:
     CGO_ENABLED: 0
   script: