mkosi,test: rename postmarketos to nura

Recently, postmarketOS is renamed to Nura:
See https://postmarketos.org/blog/2026/09/27/nura-rename/

mkosi already renamed postmarketOS to Nura:
https://github.com/systemd/mkosi/commit/580c4d94d75ef18f2a0983626cfd80bea9c44ece

Co-authored-by: Yu Watanabe <watanabe.yu+github@gmail.com>
(cherry picked from commit e9090fe18086edf48ef9f2ab420366b3c5f1d027)

.github/workflows/mkosi.yml

@@ -84,7 +84,7 @@ jobs:
             release: "9"
           - distro: centos
             release: "10"
-          - distro: postmarketos
+          - distro: nura
             release: edge
             libc: musl
             skip: TEST-92-TPM2-SWTPM
@@ -95,8 +95,8 @@ jobs:
           persist-credentials: false
       - uses: systemd/mkosi@71d7b67e01dc47ab5c51f24866c3e2195b9701d2
         with:
-          # Bootstrapping a postmarketOS tools tree on the Ubuntu host needs apk
-          apk: ${{ matrix.distro == 'postmarketos' }}
+          # Bootstrapping a Nura tools tree on the Ubuntu host needs apk
+          apk: ${{ matrix.distro == 'nura' }}
 
       # Freeing up disk space with rm -rf can take multiple minutes. Since we don't need the extra free space
       # immediately, we remove the files in the background. However, we first move them to a different location

.github/workflows/unit-tests.yml

@@ -63,7 +63,7 @@ jobs:
         run: sudo --preserve-env=GITHUB_ACTIONS,CI,CROSS_ARCH .github/workflows/unit-tests.sh RUN_${{ matrix.run_phase }}
 
   build-musl:
-    name: Build & test (musl, postmarketOS)
+    name: Build & test (musl, Nura)
     runs-on: ubuntu-24.04
     concurrency:
       group: ${{ github.workflow }}-musl-${{ github.ref }}
@@ -76,14 +76,14 @@ jobs:
 
       - uses: systemd/mkosi@71d7b67e01dc47ab5c51f24866c3e2195b9701d2
         with:
-          # Bootstrapping a postmarketOS tools tree on the Ubuntu host needs apk
+          # Bootstrapping a Nura tools tree on the Ubuntu host needs apk
           apk: true
 
       - name: Build tools tree
         run: |
           tee mkosi/mkosi.local.conf <<EOF
           [Build]
-          ToolsTreeDistribution=postmarketos
+          ToolsTreeDistribution=nura
           EOF
 
           mkosi -f box -- true