Add semgrep SAST analyzer

* Add semgrep analyzer to SAST.gitlab-ci.yml
* Add semgrep analyzer to SAST docs

changelogs/unreleased/semgrep-docs-n-template.yml

+---
+title: Add semgrep SAST analyzer
+merge_request: 53815
+author: Daniel Paul Searles
+type: added

doc/user/application_security/sast/index.md

@@ -83,6 +83,7 @@ You can also [view our language roadmap](https://about.gitlab.com/direction/secu
 | Objective-C (iOS)                                                                                                                                | [MobSF (beta)](https://github.com/MobSF/Mobile-Security-Framework-MobSF)                                      | 13.5                                          |
 | PHP                                                                                                                                              | [phpcs-security-audit](https://github.com/FloeDesignTechnologies/phpcs-security-audit)                        | 10.8                                          |
 | Python ([pip](https://pip.pypa.io/en/stable/))                                                                                                   | [bandit](https://github.com/PyCQA/bandit)                                                                     | 10.3                                          |
+| Python                                                                                                                                           | [semgrep](https://semgrep.dev)                                                                                | 13.9                                          |
 | React                                                                                                                                            | [ESLint react plugin](https://github.com/yannickcr/eslint-plugin-react)                                       | 12.5                                          |
 | Ruby on Rails                                                                                                                                    | [brakeman](https://brakemanscanner.org)                                                                       | 10.3                                          |
 | Scala ([Ant](https://ant.apache.org/), [Gradle](https://gradle.org/), [Maven](https://maven.apache.org/), and [SBT](https://www.scala-sbt.org/))  | [SpotBugs](https://spotbugs.github.io/) with the [find-sec-bugs](https://find-sec-bugs.github.io/) plugin     | 11.0 (SBT) & 11.9 (Ant, Gradle, Maven)        |
@@ -111,6 +112,7 @@ The following analyzers have multi-project support:
 - MobSF
 - PMD
 - Security Code Scan
+- Semgrep
 - SpotBugs
 - Sobelow
 
@@ -681,6 +683,7 @@ Support for custom certificate authorities was introduced in the following versi
 | `phpcs-security-audit` | [v2.8.2](https://gitlab.com/gitlab-org/security-products/analyzers/phpcs-security-audit/-/releases/v2.8.2) |
 | `pmd-apex`             | [v2.1.0](https://gitlab.com/gitlab-org/security-products/analyzers/pmd-apex/-/releases/v2.1.0)             |
 | `security-code-scan`   | [v2.7.3](https://gitlab.com/gitlab-org/security-products/analyzers/security-code-scan/-/releases/v2.7.3)   |
+| `semgrep`              | [v0.0.1](https://gitlab.com/gitlab-org/security-products/analyzers/security-code-scan/-/releases/v0.0.1)   |
 | `sobelow`              | [v2.2.0](https://gitlab.com/gitlab-org/security-products/analyzers/sobelow/-/releases/v2.2.0)              |
 | `spotbugs`             | [v2.7.1](https://gitlab.com/gitlab-org/security-products/analyzers/spotbugs/-/releases/v2.7.1)             |
 

lib/gitlab/ci/templates/Security/SAST.gitlab-ci.yml

@@ -9,7 +9,7 @@ variables:
   # (SAST, Dependency Scanning, ...)
   SECURE_ANALYZERS_PREFIX: "registry.gitlab.com/gitlab-org/security-products/analyzers"
 
-  SAST_DEFAULT_ANALYZERS: "bandit, brakeman, gosec, spotbugs, flawfinder, phpcs-security-audit, security-code-scan, nodejs-scan, eslint, sobelow, pmd-apex, kubesec, mobsf"
+  SAST_DEFAULT_ANALYZERS: "bandit, brakeman, gosec, spotbugs, flawfinder, phpcs-security-audit, security-code-scan, nodejs-scan, eslint, sobelow, pmd-apex, kubesec, mobsf, semgrep"
   SAST_EXCLUDED_ANALYZERS: ""
   SAST_EXCLUDED_PATHS: "spec, test, tests, tmp"
   SAST_ANALYZER_IMAGE_TAG: 2
@@ -244,6 +244,23 @@ security-code-scan-sast:
         - '**/*.csproj'
         - '**/*.vbproj'
 
+semgrep-sast:
+  extends: .sast-analyzer
+  image:
+    name: "$SAST_ANALYZER_IMAGE"
+  variables:
+    SAST_ANALYZER_IMAGE: "$SECURE_ANALYZERS_PREFIX/semgrep:latest"
+  rules:
+    - if: $SAST_DISABLED
+      when: never
+    - if: $SAST_EXCLUDED_ANALYZERS =~ /semgrep/
+      when: never
+    - if: $CI_COMMIT_BRANCH &&
+          $SAST_DEFAULT_ANALYZERS =~ /semgrep/ &&
+          $SAST_EXPERIMENTAL_FEATURES == 'true'
+      exists:
+        - '**/*.py'
+
 sobelow-sast:
   extends: .sast-analyzer
   image: