add NET_BIND_SERVICE on ports <1024 (#340)

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⚒️ Fixes  # <!--(issue)-->

**⚙️ Type of change**

- [x] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

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- [x] ⚖️ My code follows the style guidelines of this project
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- [ ] 📄 I have made corresponding changes to the documentation
- [x] ⚠️ My changes generate no new warnings
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**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

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library/common-test/tests/container/ports_test.yaml

@@ -136,6 +136,13 @@ tests:
               - name: port-name
                 containerPort: 1234
                 protocol: TCP
+      - documentIndex: *deploymentDoc
+        isNotSubset:
+          path: spec.template.spec.containers[0].securityContext.capabilities
+          content:
+            add:
+              - NET_BIND_SERVICE
+
       - documentIndex: &otherDeploymentDoc 1
         isKind:
           of: Deployment
@@ -147,6 +154,12 @@ tests:
               - name: port-name
                 containerPort: 53
                 protocol: TCP
+      - documentIndex: *otherDeploymentDoc
+        isSubset:
+          path: spec.template.spec.containers[0].securityContext.capabilities
+          content:
+            add:
+              - NET_BIND_SERVICE
 
   - it: should create the correct ports with hostPort
     set:

library/common-test/tests/secret/validation_test.yaml

@@ -66,7 +66,7 @@ tests:
           data: {}
     asserts:
       - failedTemplate:
-          errorMessage: Secret - Expected non-empty <data>
+          errorMessage: Secret - Expected non-empty <data> or <stringData>
 
   - it: should fail with empty type key
     set:

library/common/Chart.yaml

@@ -15,4 +15,4 @@ maintainers:
 name: common
 sources: null
 type: library
-version: 12.2.11
+version: 12.2.12

library/common/templates/lib/container/_securityContext.tpl

@@ -122,6 +122,16 @@ objectData: The object data to be used to render the container.
     {{- fail "Container - Expected <securityContext.capabilities> to be defined" -}}
   {{- end -}}
 
+  {{- $tempObjectData := (dict "shortName" $objectData.podShortName "primary" $objectData.podPrimary) -}}
+  {{- $portRange := fromJson (include "tc.v1.common.lib.helpers.securityContext.getPortRange" (dict "rootCtx" $rootCtx "objectData" $tempObjectData)) -}}
+  {{- if and $portRange.low (le (int $portRange.low) 1024) -}} {{/* If a container wants to bind a port <= 1024 add NET_BIND_SERVICE */}}
+    {{- $addCap := $secContext.capabilities.add -}}
+    {{- if not (mustHas "NET_BIND_SERIVCE" $addCap) -}}
+      {{- $addCap = mustAppend $addCap "NET_BIND_SERVICE" -}}
+    {{- end -}}
+    {{- $_ := set $secContext.capabilities "add" $addCap -}}
+  {{- end -}}
+
   {{- range $key := (list "add" "drop") -}}
     {{- $item := (get $secContext.capabilities $key) -}}
     {{- if not (kindIs "slice" $item) -}}