[Close #771] fix: set GOMAXPROCS (#772)

The following patch add automatically the environment variable `GOMAXPROCS`,
when a CPU limit is defined. Otherwise CPU throttling may occur.

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/772
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.com>
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.com>
Co-authored-by: Markus Pesch <markus.pesch@cryptic.systems>
Co-committed-by: Markus Pesch <markus.pesch@cryptic.systems>

templates/gitea/deployment.yaml

@@ -291,6 +291,13 @@ spec:
               value: /data
             - name: GITEA_TEMP
               value: /tmp/gitea
+            {{- if and (hasKey .Values.resources "limits") (hasKey .Values.resources.limits "cpu") }}
+            - name: GOMAXPROCS
+              valueFrom:
+                resourceFieldRef:
+                  divisor: "1"
+                  resource: limits.cpu
+            {{- end }}
             - name: TMPDIR
               value: /tmp/gitea
             {{- if .Values.image.rootless }}
@@ -362,7 +369,7 @@ spec:
         {{- toYaml . | nindent 8 }}
     {{- end }}
     {{- with .Values.topologySpreadConstraints }}
-      topologySpreadConstraints: 
+      topologySpreadConstraints:
         {{- toYaml . | nindent 8 }}
     {{- end }}
     {{- with .Values.tolerations }}