feat: add vault variant

README.md

@@ -174,3 +174,62 @@ Here are some advices about your **secrets** (variables marked with a :lock:):
   simply define its value as the [Base64](https://en.wikipedia.org/wiki/Base64) encoded value prefixed with `@b64@`:
   it will then be possible to mask it and the template will automatically decode it prior to using it.
 3. Don't forget to escape special characters (ex: `$` -> `$$`).
+4. You can also manage secrets using Vault variant
+
+
+## Variants
+
+The Docker template can be used in conjunction with template variants to cover specific cases.
+
+### Vault variant
+
+This variant allows delegating your secrets management to a [Vault](https://www.vaultproject.io/) server.
+
+#### Configuration
+
+In order to be able to communicate with the Vault server, the variant requires the additional configuration parameters:
+
+| Name              | Description                            | Default value     |
+| ----------------- | -------------------------------------- | ----------------- |
+| `TBC_VAULT_IMAGE` | The [Vault Secrets Provider](https://gitlab.com/to-be-continuous/tools/vault-secrets-provider) image to use (can be overridden) | `$CI_REGISTRY/to-be-continuous/tools/vault-secrets-provider:master` |
+| `VAULT_BASE_URL`  | The Vault server base API url          | _none_ |
+| `VAULT_OIDC_AUD`  | The `aud` claim for the JWT | `$CI_SERVER_URL` |
+| :lock: `VAULT_ROLE_ID`   | The [AppRole](https://www.vaultproject.io/docs/auth/approle) RoleID | **must be defined** |
+| :lock: `VAULT_SECRET_ID` | The [AppRole](https://www.vaultproject.io/docs/auth/approle) SecretID | **must be defined** |
+
+#### Usage
+
+Then you may retrieve any of your secret(s) from Vault using the following syntax:
+
+```text
+@url@http://vault-secrets-provider/api/secrets/{secret_path}?field={field}
+```
+
+With:
+
+| Name                             | Description                            |
+| -------------------------------- | -------------------------------------- |
+| `secret_path` (_path parameter_) | this is your secret location in the Vault server |
+| `field` (_query parameter_)      | parameter to access a single basic field from the secret JSON payload |
+
+#### Example
+
+```yaml
+include:
+  # main template
+  - project: 'to-be-continuous/semantic-release'
+    ref: '3.5.2'
+    file: '/templates/gitlab-ci-semrel.yml'
+  # Vault variant
+  - project: 'to-be-continuous/semantic-release'
+    ref: '3.5.2'
+    file: '/templates/gitlab-ci-semrel-vault.yml'
+
+variables:
+    # audience claim for JWT
+    VAULT_OIDC_AUD: "https://vault.acme.host"
+    # Secrets managed by Vault
+    GITLAB_TOKEN: "@url@http://vault-secrets-provider/api/secrets/b7ecb6ebabc231/semantic-release/token?field=group-access-token"
+    VAULT_BASE_URL: "https://vault.acme.host/v1"
+    # $VAULT_ROLE_ID and $VAULT_SECRET_ID defined as a secret CI/CD variable
+```

kicker.json

@@ -118,5 +118,38 @@
         }
       ]
     }
+  ],
+  "variants": [
+    {
+      "id": "vault",
+      "name": "Vault",
+      "description": "Retrieve secrets from a [Vault](https://www.vaultproject.io/) server",
+      "template_path": "templates/gitlab-ci-semrel-vault.yml",
+      "variables": [
+        {
+          "name": "TBC_VAULT_IMAGE",
+          "description": "The [Vault Secrets Provider](https://gitlab.com/to-be-continuous/tools/vault-secrets-provider) image to use",
+          "default": "$CI_REGISTRY/to-be-continuous/tools/vault-secrets-provider:master",
+          "advanced": true
+        },
+        {
+          "name": "VAULT_BASE_URL",
+          "description": "The Vault server base API url",
+          "mandatory": true
+        },
+        {
+          "name": "VAULT_ROLE_ID",
+          "description": "The [AppRole](https://www.vaultproject.io/docs/auth/approle) RoleID",
+          "mandatory": true,
+          "secret": true
+        },
+        {
+          "name": "VAULT_SECRET_ID",
+          "description": "The [AppRole](https://www.vaultproject.io/docs/auth/approle) SecretID",
+          "mandatory": true,
+          "secret": true
+        }
+      ]
+    }
   ]
 }

templates/gitlab-ci-semrel-vault.yml

+# =====================================================================================================================
+# === Vault template variant
+# =====================================================================================================================
+variables:
+  # variabilized vault-secrets-provider image
+  TBC_VAULT_IMAGE: "$CI_REGISTRY/to-be-continuous/tools/vault-secrets-provider:master"
+  # variables have to be explicitly declared in the YAML to be exported to the service
+  VAULT_ROLE_ID: "$VAULT_ROLE_ID"
+  VAULT_SECRET_ID: "$VAULT_SECRET_ID"
+  VAULT_OIDC_AUD: "$CI_SERVER_URL"
+
+.semrel-base:
+  services:
+    - name: "$TBC_TRACKING_IMAGE"
+      command: ["--service", "semrel", "3.5.2" ]
+    - name: "$TBC_VAULT_IMAGE"
+      alias: "vault-secrets-provider"
+  variables:
+    VAULT_JWT_TOKEN: "$VAULT_JWT_TOKEN"
+  id_tokens:
+    VAULT_JWT_TOKEN:
+      aud: "$VAULT_OIDC_AUD"