diff --git a/.github/actions/relocate-tmp/action.yml b/.github/actions/relocate-tmp/action.yml
new file mode 100644
index 0000000000..2dcfb2f2ae
--- /dev/null
+++ b/.github/actions/relocate-tmp/action.yml
@@ -0,0 +1,16 @@
+name: relocate tmp
+description: >-
+  Point TMPDIR and GOTMPDIR at the runner temp directory on Linux. Ubuntu 26.04
+  runners mount /tmp as a ~7.8G RAM-backed tmpfs with a user quota, so large
+  builds fail with "disk quota exceeded".
+  https://github.com/actions/runner-images/issues/14777
+runs:
+  using: composite
+  steps:
+    - if: runner.os == 'Linux'
+      shell: bash
+      run: |
+        {
+          echo "TMPDIR=$RUNNER_TEMP"
+          echo "GOTMPDIR=$RUNNER_TEMP"
+        } >> "$GITHUB_ENV"
diff --git a/.github/workflows/desktop-ci.yml b/.github/workflows/desktop-ci.yml
index 9e87ec18db..abc547c862 100644
--- a/.github/workflows/desktop-ci.yml
+++ b/.github/workflows/desktop-ci.yml
@@ -94,6 +94,8 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
+      - uses: ./.github/actions/relocate-tmp
+
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version-file: go.mod
diff --git a/.github/workflows/pr-ci.yml b/.github/workflows/pr-ci.yml
index 326bb1f309..9d0355cbab 100644
--- a/.github/workflows/pr-ci.yml
+++ b/.github/workflows/pr-ci.yml
@@ -110,6 +110,8 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
+      - uses: ./.github/actions/relocate-tmp
+
       - name: setup Go
         uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
@@ -137,6 +139,7 @@ jobs:
       contents: read
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+      - uses: ./.github/actions/relocate-tmp
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version-file: go.mod
@@ -172,6 +175,8 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
+      - uses: ./.github/actions/relocate-tmp
+
       - name: setup Go
         uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
@@ -228,6 +233,8 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
+      - uses: ./.github/actions/relocate-tmp
+
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version-file: go.mod
@@ -294,8 +301,6 @@ jobs:
             ${{ runner.os == 'Linux' && '--parallelism=1' || '' }}
         env:
           DEVSY_CLI_VERSION: v0.0.0
-          # Ubuntu 26.04 quotas /tmp: https://github.com/actions/runner-images/issues/14777
-          GOTMPDIR: ${{ runner.temp }}
 
       - name: disk usage after Linux snapshot
         if: always() && runner.os == 'Linux'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d5cdb8150e..61d715028b 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -23,6 +23,8 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
+      - uses: ./.github/actions/relocate-tmp
+
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version-file: go.mod
@@ -85,6 +87,8 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
+      - uses: ./.github/actions/relocate-tmp
+
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7
         with:
           node-version: 24