chore(deps): pin dependencies (#2)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| alpine | final | pinDigest |  -> `51b6726` |
| koalaman/shellcheck-alpine |  | pinDigest |  -> `f73b035` |
| [pipelinecomponents/hadolint](https://gitlab.com/pipeline-components/hadolint) |  | pinDigest |  -> `430e949` |
| plugins/docker |  | pinDigest |  -> `2f15740` |
| [zricethezav/gitleaks](https://github.com/gitleaks/gitleaks) |  | pinDigest |  -> `e5f6d1a` |

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Reviewed-on: #2
Co-authored-by: Renovate Bot <renovate@mgrote.net>
Co-committed-by: Renovate Bot <renovate@mgrote.net>

.woodpecker/build.yml

@@ -3,7 +3,7 @@ depends_on:
   - lint
 steps:
   selfhosted_tag:
-    image: plugins/docker
+    image: plugins/docker@sha256:2f157400c2cb7de1b309b0f044f119375108218e54d38e1340e00b9f93abdefb
     settings:
       dockerfile: Dockerfile
       repo: registry.mgrote.net/nextcloud-cronjob
@@ -15,7 +15,7 @@ steps:
         - tag
 
   selfhosted_push:
-    image: plugins/docker
+    image: plugins/docker@sha256:2f157400c2cb7de1b309b0f044f119375108218e54d38e1340e00b9f93abdefb
     settings:
       dockerfile: Dockerfile
       repo: registry.mgrote.net/nextcloud-cronjob

.woodpecker/lint.yml

@@ -1,7 +1,7 @@
 ---
 steps:
   gitleaks:
-    image: zricethezav/gitleaks:v8.18.0
+    image: zricethezav/gitleaks:v8.18.0@sha256:e5f6d1a62786affd1abd882ecc73e9353ce78adea1650711f6e351767723712d
     commands:
       - gitleaks detect --no-git --verbose --source $CI_WORKSPACE
     when:
@@ -10,7 +10,7 @@ steps:
           - tag
 
   hadolint:
-    image: pipelinecomponents/hadolint:0.25.9
+    image: pipelinecomponents/hadolint:0.25.9@sha256:430e949e6554d56ffc2dd08898ee609c71822d7fa1033f7c4dc240e90f2aac23
     commands:
       - hadolint Dockerfile
     when:
@@ -19,7 +19,7 @@ steps:
           - tag
 
   shellcheck:
-    image: koalaman/shellcheck-alpine:stable
+    image: koalaman/shellcheck-alpine:stable@sha256:f73b035c8ebfc8a66ba54e07af5cc41e790cf41fff45317914b1ce677dd9cada
     commands:
       - "find . -name *.sh -exec shellcheck -x {} +"
     when:

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3
+FROM alpine:3@sha256:51b67269f354137895d43f3b3d810bfacd3945438e94dc5ac55fdac340352f48
 
 # hadolint ignore=DL3018
 RUN apk add --no-cache docker-cli bash tini