actions: Workaround YAML limitation for timeout-minutes

Because Github Actions wants an int, we use fromJSON to hack around
this.

.github/workflows/build.yml

@@ -27,7 +27,7 @@ jobs:
   build:
     name: ${{ matrix.OS_NAME }} (${{ matrix.configuration }})
     runs-on: ${{ matrix.os }}
-    timeout-minutes: ${{ vars.JOB_TIMEOUT }}
+    timeout-minutes: ${{ fromJSON(vars.JOB_TIMEOUT) }}
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
@@ -110,7 +110,7 @@ jobs:
   build_macos:
     name: macOS Universal (${{ matrix.configuration }})
     runs-on: ubuntu-latest
-    timeout-minutes: ${{ vars.JOB_TIMEOUT }}
+    timeout-minutes: ${{ fromJSON(vars.JOB_TIMEOUT) }}
     strategy:
       matrix:
         configuration: [ Debug, Release ]

.github/workflows/flatpak.yml

@@ -12,7 +12,7 @@ concurrency: flatpak-release
 
 jobs:
   release:
-    timeout-minutes: ${{ vars.JOB_TIMEOUT }}
+    timeout-minutes: ${{ fromJSON(vars.JOB_TIMEOUT) }}
     runs-on: ubuntu-latest
 
     env:

.github/workflows/nightly_pr_comment.yml

@@ -7,7 +7,7 @@ jobs:
   pr_comment:
     if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
     runs-on: ubuntu-latest
-    timeout-minutes: ${{ vars.JOB_TIMEOUT }}
+    timeout-minutes: ${{ fromJSON(vars.JOB_TIMEOUT) }}
     steps:
       - uses: actions/github-script@v6
         with:

.github/workflows/release.yml

@@ -46,7 +46,7 @@ jobs:
   release:
     name: Release ${{ matrix.OS_NAME }}
     runs-on: ${{ matrix.os }}
-    timeout-minutes: ${{ vars.JOB_TIMEOUT }}
+    timeout-minutes: ${{ fromJSON(vars.JOB_TIMEOUT) }}
     strategy:
       matrix:
         os: [ ubuntu-latest, windows-latest ]
@@ -144,7 +144,7 @@ jobs:
   macos_release:
     name: Release MacOS universal
     runs-on: ubuntu-latest
-    timeout-minutes: ${{ vars.JOB_TIMEOUT }}
+    timeout-minutes: ${{ fromJSON(vars.JOB_TIMEOUT) }}
     steps:
       - uses: actions/checkout@v3