Use ubuntu-20.04 instead of ubuntu-latest

Author: jessebraham

.github/workflows/package.yml

@@ -33,7 +33,7 @@ jobs:
           override: true
       - uses: Swatinem/rust-cache@v1
       - name: Build dependencies for other ubuntu targets
-        if: inputs.runs_on == 'ubuntu-latest'
+        if: inputs.runs_on == 'ubuntu-20.04'
         run: |
           sudo sed -i 's/azure.archive.ubuntu.com/archive.ubuntu.com/' /etc/apt/sources.list
           sudo apt-get update

.github/workflows/raspberry_package.yml

@@ -16,7 +16,7 @@ env:
 
 jobs:
   publish-release:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:

.github/workflows/raspberry_rust.yml

@@ -13,7 +13,7 @@ env:
 jobs:
   rust-ci:
     name: "Rust CI: ${{ matrix.job.name }} - ${{ matrix.board.target }}"
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:

.github/workflows/release.yml

@@ -22,13 +22,13 @@ jobs:
   x86_64-unknown-linux-gnu:
     uses: ./.github/workflows/package.yml
     with:
-      runs_on: ubuntu-latest
+      runs_on: ubuntu-20.04
       target: x86_64-unknown-linux-gnu
 
   x86_64-unknown-linux-musl:
     uses: ./.github/workflows/package.yml
     with:
-      runs_on: ubuntu-latest
+      runs_on: ubuntu-20.04
       target: x86_64-unknown-linux-musl
 
   # macOS

.github/workflows/rust.yml

@@ -13,7 +13,7 @@ env:
 jobs:
   check:
     name: Check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Change apt mirror and install dependencies
         run: |
@@ -33,7 +33,7 @@ jobs:
 
   check-lib:
     name: Check (lib)
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Change apt mirror and install dependencies
         run: |
@@ -54,7 +54,7 @@ jobs:
 
   msrv:
     name: Check MSRV
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Change apt mirror and install dependencies
         run: |
@@ -74,7 +74,7 @@ jobs:
 
   test-lib:
     name: Unit Test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Change apt mirror and install dependencies
         run: |
@@ -95,7 +95,7 @@ jobs:
 
   fmt:
     name: Rustfmt
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -112,7 +112,7 @@ jobs:
 
   clippy:
     name: Clippy
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Change apt mirror and install dependencies
         run: |