diff --git a/.forgejo/workflows/before_almalinux_8.yaml b/.forgejo/workflows/before_almalinux_8.yaml
index d4e9eb0..32b4601 100644
--- a/.forgejo/workflows/before_almalinux_8.yaml
+++ b/.forgejo/workflows/before_almalinux_8.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: almalinux:8
+      image: ${{vars.DOCKER||'docker.io'}}/almalinux:8
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/before_alpine_3.19.yaml b/.forgejo/workflows/before_alpine_3.19.yaml
index 9ec0468..0f1bc00 100644
--- a/.forgejo/workflows/before_alpine_3.19.yaml
+++ b/.forgejo/workflows/before_alpine_3.19.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: alpine:3.19
+      image: ${{vars.DOCKER||'docker.io'}}/alpine:3.19
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/before_archlinux_base-20231112.0.191179.yaml b/.forgejo/workflows/before_archlinux_base-20231112.0.191179.yaml
index 8c2dc99..5980a5a 100644
--- a/.forgejo/workflows/before_archlinux_base-20231112.0.191179.yaml
+++ b/.forgejo/workflows/before_archlinux_base-20231112.0.191179.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: archlinux:base-20231112.0.191179
+      image: ${{vars.DOCKER||'docker.io'}}/archlinux:base-20231112.0.191179
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/before_debian_bullseye.yaml b/.forgejo/workflows/before_debian_bullseye.yaml
index 110d635..7cc0456 100644
--- a/.forgejo/workflows/before_debian_bullseye.yaml
+++ b/.forgejo/workflows/before_debian_bullseye.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: debian:bullseye
+      image: ${{vars.DOCKER||'docker.io'}}/debian:bullseye
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/before_fedora_39.yaml b/.forgejo/workflows/before_fedora_39.yaml
index 65af7b7..540a7c4 100644
--- a/.forgejo/workflows/before_fedora_39.yaml
+++ b/.forgejo/workflows/before_fedora_39.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: fedora:39
+      image: ${{vars.DOCKER||'docker.io'}}/fedora:39
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/before_rockylinux_8.yaml b/.forgejo/workflows/before_rockylinux_8.yaml
index 263556f..41ce0a7 100644
--- a/.forgejo/workflows/before_rockylinux_8.yaml
+++ b/.forgejo/workflows/before_rockylinux_8.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: rockylinux:8
+      image: ${{vars.DOCKER||'docker.io'}}/rockylinux:8
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/before_ubuntu_jammy.yaml b/.forgejo/workflows/before_ubuntu_jammy.yaml
index caa988d..51b7f82 100644
--- a/.forgejo/workflows/before_ubuntu_jammy.yaml
+++ b/.forgejo/workflows/before_ubuntu_jammy.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: ubuntu:jammy
+      image: ${{vars.DOCKER||'docker.io'}}/ubuntu:jammy
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/latest_almalinux_9.yaml b/.forgejo/workflows/latest_almalinux_9.yaml
index 7ee2c22..9592b82 100644
--- a/.forgejo/workflows/latest_almalinux_9.yaml
+++ b/.forgejo/workflows/latest_almalinux_9.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: almalinux:9
+      image: ${{vars.DOCKER||'docker.io'}}/almalinux:9
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/latest_alpine_3.20.yaml b/.forgejo/workflows/latest_alpine_3.20.yaml
index 84a9249..40ba169 100644
--- a/.forgejo/workflows/latest_alpine_3.20.yaml
+++ b/.forgejo/workflows/latest_alpine_3.20.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: alpine:3.20
+      image: ${{vars.DOCKER||'docker.io'}}/alpine:3.20
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/latest_archlinux_base-20240101.0.204074.yaml b/.forgejo/workflows/latest_archlinux_base-20240101.0.204074.yaml
index 66acd9a..762db90 100644
--- a/.forgejo/workflows/latest_archlinux_base-20240101.0.204074.yaml
+++ b/.forgejo/workflows/latest_archlinux_base-20240101.0.204074.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: archlinux:base-20240101.0.204074
+      image: ${{vars.DOCKER||'docker.io'}}/archlinux:base-20240101.0.204074
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/latest_debian_bookworm.yaml b/.forgejo/workflows/latest_debian_bookworm.yaml
index 5d6fab0..d8059a9 100644
--- a/.forgejo/workflows/latest_debian_bookworm.yaml
+++ b/.forgejo/workflows/latest_debian_bookworm.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: debian:bookworm
+      image: ${{vars.DOCKER||'docker.io'}}/debian:bookworm
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/latest_fedora_40.yaml b/.forgejo/workflows/latest_fedora_40.yaml
index 12fbeb1..b3e27ba 100644
--- a/.forgejo/workflows/latest_fedora_40.yaml
+++ b/.forgejo/workflows/latest_fedora_40.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: fedora:40
+      image: ${{vars.DOCKER||'docker.io'}}/fedora:40
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/latest_rockylinux_9.yaml b/.forgejo/workflows/latest_rockylinux_9.yaml
index 56776cb..37ee425 100644
--- a/.forgejo/workflows/latest_rockylinux_9.yaml
+++ b/.forgejo/workflows/latest_rockylinux_9.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: rockylinux:9
+      image: ${{vars.DOCKER||'docker.io'}}/rockylinux:9
     steps:
     - name: spcd
       run: >
diff --git a/.forgejo/workflows/latest_ubuntu_noble.yaml b/.forgejo/workflows/latest_ubuntu_noble.yaml
index 93491c1..6135bae 100644
--- a/.forgejo/workflows/latest_ubuntu_noble.yaml
+++ b/.forgejo/workflows/latest_ubuntu_noble.yaml
@@ -2,7 +2,7 @@ on: [push]
 jobs:
   job:
     container:
-      image: ubuntu:noble
+      image: ${{vars.DOCKER||'docker.io'}}/ubuntu:noble
     steps:
     - name: spcd
       run: >