fix(docker): pin numeric uid/gid so hadolint DL3066 passes

hadolint 2.15.x - pulled in by hadolint-action v3.5.0 - adds DL3066
("Non-numeric user-id may not be resolvable by host system"). The
Dockerfile's `USER muser` trips it and the hadolint job exits 1 (hadolint
fails on info-level findings by default), turning the PR Checks pipeline
red on the Renovate bump PR.

muser was created without an explicit uid/gid, so its numeric identity
depended on busybox's auto-assignment. Both ids are now pinned at
1000:1000 - the values Alpine was already assigning - and USER uses the
numeric form, which is always resolvable by the host.

Verified with the upstream hadolint v2.15.1 binary: the previous
Dockerfile reports "Dockerfile:9 DL3066 info" and exits 1, the fixed one
lints clean and exits 0.

The hadolint-action v3.3.0 -> v3.5.0 bump is included here (all four
workflows, SHA 06be81ba) so that master ends up on v3.5.0 with a clean
lint - superseding Renovate PR #23.

.gitea/workflows/cron.yaml

@@ -11,7 +11,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
       - name: Hadolint
-        uses: hadolint/hadolint-action@2332a7b74a6de0dda2e2221d575162eba76ba5e5 # v3.3.0
+        uses: hadolint/hadolint-action@06be81baf89a55ffd0e24b8f04a4185738dd3387 # v3.5.0
         continue-on-error: true
 
   build:

.gitea/workflows/main.yaml

@@ -10,7 +10,7 @@ jobs:
     continue-on-error: true
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
-      - uses: hadolint/hadolint-action@2332a7b74a6de0dda2e2221d575162eba76ba5e5 # v3.3.0
+      - uses: hadolint/hadolint-action@06be81baf89a55ffd0e24b8f04a4185738dd3387 # v3.5.0
         with:
           dockerfile: Dockerfile
 

.gitea/workflows/pr.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
-      - uses: hadolint/hadolint-action@2332a7b74a6de0dda2e2221d575162eba76ba5e5 # v3.3.0
+      - uses: hadolint/hadolint-action@06be81baf89a55ffd0e24b8f04a4185738dd3387 # v3.5.0
         with:
           dockerfile: Dockerfile
 

.gitea/workflows/tag.yaml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
       - name: Hadolint
-        uses: hadolint/hadolint-action@2332a7b74a6de0dda2e2221d575162eba76ba5e5 # v3.3.0
+        uses: hadolint/hadolint-action@06be81baf89a55ffd0e24b8f04a4185738dd3387 # v3.5.0
         continue-on-error: true
 
   build: