Fix Ubuntu OpenJPEG provisioning (#113)

.gitea/workflows/jpeg2000.yml

@@ -10,6 +10,7 @@ on:
       - "crates/libremetaverse-types/**"
       - "crates/libremetaverse-imaging/**"
       - "crates/libremetaverse-openjpeg/**"
+      - "tools/install_openjpeg_2_5_4.sh"
   pull_request:
     paths:
       - ".gitea/workflows/jpeg2000.yml"
@@ -19,16 +20,18 @@ on:
       - "crates/libremetaverse-types/**"
       - "crates/libremetaverse-imaging/**"
       - "crates/libremetaverse-openjpeg/**"
+      - "tools/install_openjpeg_2_5_4.sh"
   workflow_dispatch:
 
 jobs:
   linux:
     runs-on: ubuntu-latest
     env:
-      # Ubuntu 24.04 also ships an older libopenjp2.so.7. Ensure both
-      # pkg-config and the runtime loader select the audited 2.5.4 install.
-      PKG_CONFIG_PATH: /usr/local/lib/pkgconfig
-      LD_LIBRARY_PATH: /usr/local/lib
+      # Ubuntu also ships an older libopenjp2.so.7. Ensure both pkg-config and
+      # the runtime loader select this run's isolated, audited 2.5.4 install.
+      OPENJPEG_PREFIX: /tmp/metacrate-openjpeg-${{ github.run_id }}
+      PKG_CONFIG_PATH: /tmp/metacrate-openjpeg-${{ github.run_id }}/lib/pkgconfig
+      LD_LIBRARY_PATH: /tmp/metacrate-openjpeg-${{ github.run_id }}/lib
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
@@ -36,12 +39,7 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install --yes build-essential cmake pkg-config
-          git clone --branch v2.5.4 --depth 1 https://github.com/uclouvain/openjpeg.git /tmp/openjpeg-2.5.4
-          cmake -S /tmp/openjpeg-2.5.4 -B /tmp/openjpeg-build -DBUILD_CODEC=OFF -DBUILD_SHARED_LIBS=ON -DCMAKE_BUILD_TYPE=Release
-          cmake --build /tmp/openjpeg-build --parallel
-          sudo cmake --install /tmp/openjpeg-build
-          sudo ldconfig
-          test "$(pkg-config --modversion libopenjp2)" = "2.5.4"
+          tools/install_openjpeg_2_5_4.sh "$OPENJPEG_PREFIX"
       - name: Build and test optional feature
         run: |
           cargo test -p libremetaverse-imaging --features jpeg2000